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{{Short description|Star in the constellation Coma Berenices}}
{{Starbox begin {{Starbox begin
| name = ]}} | name = ]}}
{{Starbox image {{Starbox image
| image =
⚫ | image = ]
{{Location mark
| caption = ] constellation}}
⚫ | image = Coma Berenices constellation map.svg | width = 250
{{Starbox observe HELLO, MY NAME IS JACK, I AM 9 YEARS OF AGE. MY MOMMIES NAME IS RACHEL. PLEASE COME TO MY BIRTHDAY PARTY TOMMORROW AT 430 AND IT ENDS WHENEVER YOU WANT IT TO END. MY ADDRESS IS 54321 AVERY STREET. IF YOU ARE COMING, PLEASE CALL 801-678-1129 BEFORE COMING> BUT PLEASE COME. I HAVE NO FRIENDS AND I AM LONELY ALL BY MYSELF SO PLEASE COME TOMMORROW'''Bold text'''
| alt = Map of the constellation Coma Berenices | float = center
⚫ | epoch = ]
| mark = Red circle.svg | mark_width = 15
⚫ | equinox = ] (])
| x = 130 | y = 569
}}
| caption = α Comae Berenices (circled) in the constellation Coma Berenices
}}
{{Starbox observe
⚫ | epoch = J2000.0
⚫ | equinox = J2000.0 (])
| constell = ] | constell = ]
| ra = {{RA|13|09|59.2766}}<ref name=sb0>{{SIMBAD link|alf+com|NSV 6116 -- Variable Star}}, database entry, ]. Accessed on line September 3, 2008.</ref> | ra = {{RA|13|09|59.285}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|+17|31|45.953}}<ref name=sb0 /> | dec = {{DEC|+17|31|46.04}}<ref name="van Leeuwen2007"/>
| appmag_v=4.29&nbsp;to&nbsp;4.35<br /><small>(combined)</small/><ref name=nsv1>NSV 6116, database entry, , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.</ref><br />A: 4.85 / B: 5.53<ref name=orb /> | appmag_v=4.29&nbsp;to&nbsp;4.35<br /><small>(combined)</small><ref name=nsv1>NSV 6116, database entry, , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.</ref><br />A: 4.85 / B: 5.53<ref name=orb />
}} }}
{{Starbox character {{Starbox character
| class = A: F5V / B: F5V<br /><small>(binary star)</small><ref name=kaler>, Jim Kaler, ''Stars''. Accessed on line September 3, 2008.</ref> | class = A: F5V / B: F5V<br /><small>(binary star)</small><ref name=kaler> {{webarchive|url=https://web.archive.org/web/20080511204821/http://www.astro.uiuc.edu/~kaler/sow/diadem.html |date=2008-05-11 }}, Jim Kaler, ''Stars''. Accessed on line September 3, 2008.</ref>
| u-b = −0.06<ref name=bsc2>, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., ] ID . Accessed on line September 3, 2008.</ref> | u-b = −0.06<ref name=bsc2>, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., ] ID . Accessed on line September 3, 2008.</ref>
| b-v = 0.45<ref name=bsc2 /> | b-v = 0.45<ref name=bsc2 />
Line 20: Line 28:
}} }}
{{Starbox astrometry {{Starbox astrometry
| radial_v = −17.7&nbsp;±&nbsp;0.9<ref name=sb0 /> | radial_v = {{val|−17.7|0.9}}<ref name=sb0 />
| prop_mo_ra = −445.96<ref name=sb0 /> | prop_mo_ra = {{val|−433.13|0.70}}<ref name="van Leeuwen2007"/>
| prop_mo_dec = 129.69<ref name=sb0 /> | prop_mo_dec = {{val|141.24|0.51}}<ref name="van Leeuwen2007"/>
| parallax = 51.7 | parallax = 56.10
| p_error = 5.7 | p_error = 0.89
| parallax_footnote = <ref name="van Leeuwen2007"/>
| parallax_footnote = <ref>, database entry, Preliminary Version of the Third Catalogue of Nearby Stars, W. Gliese and H. Jahreiss, ] ID . Accessed on line September 3, 2008.</ref>
| absmag_v= 3 <small>(combined)</small><ref>From apparent magnitude and parallax.</ref> | absmag_v= 3.82<ref name=Reiners2006/>
}} }}
{{Starbox visbin {{Starbox orbit
|reference=<ref name=orb/> | reference = <ref name="Muterspaugh2015"/>
| period = {{val|25.8696|0.008219}}
|period_unitless=26.052&nbsp;±&nbsp;0.013&nbsp;years
| axis = {{val|0.67144|0.00033}}
|axis_unitless=0.67633&nbsp;±&nbsp;0.00095]
|periastron=]1989.2052&nbsp;±&nbsp;0.0061 | periastron = {{val|57056.84|0.36}}
|inclination=90.098&nbsp;±&nbsp;0.051 | inclination = {{val|90.0501|0.0062}}
|node=192.235&nbsp;±&nbsp;0.047 | node = {{val|12.2272|0.0098}}
|eccentricity=0.5083&nbsp;±&nbsp;0.0026 | eccentricity = {{val|0.51060|0.00061}}
|periarg=280.121&nbsp;±&nbsp;0.070 | periarg = {{val|100.563|0.026}}
}}
{{Starbox detail
| component1 = A
| mass = 1.237<ref name=pavlovic/>
| luminosity = 1.72<ref name=brummelaar/>
| temperature = 6,365<ref name=pastel/>
| metal_fe = {{val|-0.23}}<ref name=pastel/>
| gravity = 4.19<ref name=pastel/>
| component2 = B
| mass2 = 1.087<ref name=pavlovic/>
| temperature2 = 6,378<ref name=brummelaar/>
| luminosity2 = 1.75<ref name=brummelaar/>
}} }}
{{Starbox catalog {{Starbox catalog
| names=α&nbsp;Com, Alpha&nbsp;Comae&nbsp;Berenices, Alpha&nbsp;Com, ], 42&nbsp;Com, ], ]&nbsp;8804&nbsp;AB, ]+18°2697, ]&nbsp;J13100+1732AB, ]&nbsp;17833, ]&nbsp;501AB, ]&nbsp;114378/114379, ]&nbsp;64241, ]&nbsp;4968/4969, ]&nbsp;13051+1803&nbsp;AB, ]&nbsp;13802, ]&nbsp;33105, ]&nbsp;129630, ]&nbsp;100443, ]&nbsp;13100+1732AB.<ref name=sb0 /><ref>{{SIMBAD link|HD+114378|HD 114378 -- Star in double system}}, database entry, ], accessed on line September 3, 2008.</ref><ref>{{SIMBAD link|HD+114379|HD 114379 -- Star in double system}}, database entry, ], accessed on line September 3, 2008.</ref> | names=α&nbsp;Com, Alpha&nbsp;Comae&nbsp;Berenices, Alpha&nbsp;Com, ], 42&nbsp;Com, ], ]&nbsp;8804&nbsp;, ]+18&nbsp;2697, ]&nbsp;J13100+1732, ]&nbsp;17833, ]&nbsp;501, ]&nbsp;64241, ]&nbsp;13051+1803&nbsp;AB, ]&nbsp;13802, ]&nbsp;33105, ]&nbsp;129630, ]&nbsp;100443, ]&nbsp;13100+1732.<ref name=sb0 /><ref>{{SIMBAD link|HD+114378|HD 114378 -- Star in double system}}, database entry, ], accessed on line September 3, 2008.</ref><ref>{{SIMBAD link|HD+114379|HD 114379 -- Star in double system}}, database entry, ], accessed on line September 3, 2008.</ref>
| component1 = A
| names1=]&nbsp;114378, ]&nbsp;4968
| component2 = B
| names2=]&nbsp;114379, ]&nbsp;4969
}} }}
{{Starbox reference {{Starbox reference
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{{Starbox end}} {{Starbox end}}


'''Alpha Comae Berenices''' (Alpha Com, α Com, α Comae Berenices) is a ] in the ] ] (Berenice's Hair). Although it has the ] "alpha", at ] 4.32 it is actually fainter than ]. It has the traditional name ''']'''. It is said to represent the crown worn by ]. A name occasionally seen is '''Al Dafirah''', from the Arabic الضفيرة ''ađ̧-đ̧afīrah'' "the braid". '''Alpha Comae Berenices''' ('''α Comae Berenices''', abbreviated '''Alpha Com''', '''α Com''') is a ] in the ] of ] (]'s Hair), {{convert|17.8|pc|ly}} away. It consists of two ] stars, each a little hotter and more luminous than the Sun.


Alpha Comae Berenices is said to represent the crown worn by Queen Berenice. The two components are designated Alpha Comae Berenices A (officially named '''Diadem''' {{IPAc-en|'|d|ai|@|d|E|m}}, the traditional name for the system)<ref name="IAU-LSN">{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=16 December 2017}}</ref> and B.
⚫ In ], {{lang|zh|太微左垣}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán}}), meaning '']'', refers to an asterism consisting of α Comae Berenices, ], ], ] and ].<ref>{{zh icon}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.</ref> Consequently, α Comae Berenices itself is known as {{lang|zh|太微左垣五}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán wǔ}}, {{lang-en|the Fifth Star of Left Wall of Supreme Palace Enclosure}}.),<ref>{{zh icon}} , Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> representing {{lang|zh|東上將}} ({{lang|zh-Latn|Dōngshǎngjiāng}}), meaning ''The First Eastern General''.<ref>{{zh icon}} , Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> 東上將 (Dōngshǎngjiāng), westernized into '''Shang Tseang''', but the name ''Shang Tseang'' was designated for "v Comae Berenices" by R.H. Allen and the meaning is "a Higher General" <ref></ref>

== Nomenclature ==

''α Comae Berenices'' (] to ''Alpha Comae Berenices'') is the system's ]. The designations of the two components as ''Alpha Comae Berenices A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for ]s, and adopted by the ] (IAU).<ref name="planetnaming">{{cite arXiv |title=On the naming convention used for multiple star systems and extrasolar planets |date=2010 |eprint=1012.0707 |class=astro-ph.SR |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. }}</ref>

The system bore the traditional names ''Diadem'' and ''Al Dafirah,'' the latter derived from the Arabic الضفيرة ''ađ̧-đ̧afīrah'' "the braid".{{cn|date=January 2018}} In 2016, the ] organized a ] (WGSN)<ref>{{Cite web|url=https://www.iau.org/science/scientific_bodies/working_groups/280/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2017-03-31}}</ref> to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire ].<ref name="TriRpt18">{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |access-date=2018-07-14}}</ref> It approved the name ''Diadem'' for the component Alpha Comae Berenices A on 1 February 2017 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-LSN"/>

⚫ In ], {{lang|zh|太微左垣}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán}}), meaning '']'', refers to an ] consisting of Alpha Comae Berenices, ], ], ] and ].<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, the ] for Alpha Comae Berenices itself is {{lang|zh|太微左垣五}} ({{lang|zh-Latn|Tài Wēi Zuǒ Yuán wǔ}}, {{langx|en|the Fifth Star of Left Wall of Supreme Palace Enclosure}}.),<ref>{{in lang|zh}} {{webarchive|url=https://web.archive.org/web/20090929163750/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_c_d.htm |date=2009-09-29 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> representing {{lang|zh|東上將}} ({{lang|zh-Latn|Dōngshǎngjiāng}}), meaning ''The First Eastern General''.<ref>{{in lang|zh}} {{webarchive|url=https://web.archive.org/web/20080924022136/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm |date=2008-09-24 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> 東上將 (Dōngshǎngjiāng), westernized into ''Shang Tseang'', but that name was designated for "v Comae Berenices" by R.H. Allen and the meaning is "a Higher General".<ref></ref>


==Properties== ==Properties==


Although Alpha Comae Berenices bears the title "]", at ] 4.32 it is actually fainter than ].
⚫ It is a ], with almost equal components of magnitudes 5.05m and 5.08m orbiting each other with a period of 25.87 years. The system, estimated to be 65 ] distant, appears so nearly "edge-on" from the Earth that the two stars appear to move back-and-forth in a straight line with a maximum separation of only 0.7 arcsec. It is not known whether eclipses occur between the two components at periastron (minimum separation)&mdash;the only such passage since the determination of the orbit, in 1990, was not quantitatively followed by observers.


⚫ It is a ], with almost equal components of magnitudes 5.05 m and 5.08 m ]ing each other with a ] of 25.87 years. The system, estimated to be 58 ] distant, appears so nearly "edge-on" from the Earth that the two stars appear to move back-and-forth in a straight line with a maximum separation of only 0.7 arcsec. Eclipses are predicted to occur between the two components however they have not been successfully observed due to miscalculations of the time of eclipse.<ref name="Muterspaugh2015"/>
⚫ The mean separation between them is approximately 10 ], about the distance between the Sun and ].


⚫ The mean separation between them is approximately 10 ], about the distance between the Sun and ].
⚫ The binary star has a ], CCDM J13100+1732C, of apparent magnitude 10.2, located 89 ]s away along a position angle of 345°.<ref name=wds>Entry 13100+1732, discoverer code STF1728, components AB-C, , ]. Accessed on line September 3, 2008.</ref>

⚫ The binary star has a ], CCDM J13100+1732C, of apparent magnitude 10.2, located 89 ]s away along a position angle of 345°.<ref name=wds>Entry 13100+1732, discoverer code STF1728, components AB-C, {{webarchive|url=https://web.archive.org/web/20080413021643/http://ad.usno.navy.mil/wds/wdsnewframe3.html |date=2008-04-13 }}, ]. Accessed on line September 3, 2008.</ref>

Alpha Comae Berenicis forms an isosceles triangle with globular star clusters ] and ]. The apparent diameter of this triangle is a little more than one degree. The location of Alpha Comae Berenicis is westward (preceding) of both globular star clusters.


==References== ==References==
{{reflist|refs= {{reflist|refs=

<ref name="Muterspaugh2015">{{cite journal | title=Predicting the α Comae Berenices Time of Eclipse: How 3 Ambiguous Measurements out of 609 Caused a 26 Year Binary's Eclipse to be Missed | last1=Muterspaugh | first1=Matthew W. | last2=Wijngaarden | first2=M. J. P. | last3=Henrichs | first3=H. F. | last4=Lane | first4=Benjamin F. | last5=Hartkopf | first5=William I. | last6=Henry | first6=Gregory W. | last7=Schaefer | first7=Gail H. | last8=Farrington | first8=Chris | last9=Hummel | first9=Christian A. | last10=Zavala | first10=R. T. | display-authors=1 | journal=The Astronomical Journal | volume=150 | issue=5 | at=140 | date=2015 | arxiv=1501.05639 | bibcode=2015AJ....150..140M | doi=10.1088/0004-6256/150/5/140 | s2cid=119282868 }}</ref>

<ref name=Reiners2006>{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}</ref>


<ref name=orb>Entry 13100+1732, <ref name=orb>Entry 13100+1732,
, {{Webarchive|url=https://web.archive.org/web/20050424035159/http://ad.usno.navy.mil/wds/orb6/orb6orbits.txt |date=2005-04-24 }},
]. Accessed on line September 3, 2008.</ref> ]. Accessed on line September 3, 2008.</ref>

<ref name=sb0>{{SIMBAD link|alf+com|NSV 6116 -- Variable Star}}, database entry, ]. Accessed on line September 3, 2008.</ref>

<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/abs/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 }} </ref>

<ref name=pavlovic>{{cite journal|bibcode=2005SerAJ.170...73P|title=Orbits of Seven Edge-On Visual Double Stars|journal=Serbian Astronomical Journal|volume=170|pages=73–78|last1=Pavlovic|first1=R.|last2=Todorovic|first2=N.|year=2005|issue=170|doi=10.2298/SAJ0570073P|doi-access=free}}</ref>

<ref name=brummelaar>{{cite journal|bibcode=2000AJ....119.2403T|title=Binary Star Differential Photometry Using the Adaptive Optics System at Mount Wilson Observatory|journal=The Astronomical Journal|volume=119|issue=5|pages=2403|last1=Ten Brummelaar|first1=Theo|last2=Mason|first2=Brian D.|last3=McAlister|first3=Harold A.|last4=Roberts|first4=Lewis C.|last5=Turner|first5=Nils H.|last6=Hartkopf|first6=William I.|last7=Bagnuolo|first7=William G.|year=2000|doi=10.1086/301338|doi-access=free}}</ref>

<ref name=pastel>{{cite journal|bibcode=2016A&A...591A.118S|title=The PASTEL catalogue: 2016 version|journal=Astronomy and Astrophysics|volume=591|pages=A118|last1=Soubiran|first1=Caroline|last2=Le Campion|first2=Jean-François|last3=Brouillet|first3=Nathalie|last4=Chemin|first4=Laurent|year=2016|doi=10.1051/0004-6361/201628497|arxiv=1605.07384|s2cid=119258214}}</ref>


}} }}


== External links == == External links ==
{{Sky|13|09|59.285|+|17|31|46.04}}
{{Nearest star systems|12}}
{{Stars of Coma Berenices}} {{Stars of Coma Berenices}}


{{DEFAULTSORT:Alpha Comae Berenices}}
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Latest revision as of 23:13, 25 October 2024

Star in the constellation Coma Berenices
α Comae Berenices
Map of the constellation Coma Berenices α Comae Berenices (circled) in the constellation Coma Berenices
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Coma Berenices
Right ascension 13 09 59.285
Declination +17° 31′ 46.04″
Apparent magnitude (V) 4.29 to 4.35
(combined)
A: 4.85 / B: 5.53
Characteristics
Spectral type A: F5V / B: F5V
(binary star)
U−B color index −0.06
B−V color index 0.45
V−R color index 0.2
R−I color index 0.2
Astrometry
Radial velocity (Rv)−17.7±0.9 km/s
Proper motion (μ) RA: −433.13±0.70 mas/yr
Dec.: 141.24±0.51 mas/yr
Parallax (π)56.10 ± 0.89 mas
Distance58.1 ± 0.9 ly
(17.8 ± 0.3 pc)
Absolute magnitude (MV)3.82
Orbit
Period (P)25.8696±0.008219 yr
Semi-major axis (a)0.67144±0.00033″
Eccentricity (e)0.51060±0.00061
Inclination (i)90.0501±0.0062°
Longitude of the node (Ω)12.2272±0.0098°
Periastron epoch (T)57056.84±0.36
Argument of periastron (ω)
(secondary)		100.563±0.026°
Details
A
Mass1.237 M☉
Luminosity1.72 L☉
Surface gravity (log g)4.19 cgs
Temperature6,365 K
Metallicity −0.23 dex
B
Mass1.087 M☉
Luminosity1.75 L☉
Temperature6,378 K
Other designations
α Com, Alpha Comae Berenices, Alpha Com, 42 Comae Berenices, 42 Com, STF 1728, ADS 8804 , BD+18 2697, CCDM J13100+1732, GC 17833, Gliese 501, HIP 64241, IDS 13051+1803 AB, LTT 13802, NLTT 33105, PPM 129630, SAO 100443, WDS 13100+1732.
A: HD 114378, HR 4968
B: HD 114379, HR 4969
Database references
SIMBADdata

Alpha Comae Berenices (α Comae Berenices, abbreviated Alpha Com, α Com) is a binary star in the constellation of Coma Berenices (Berenice's Hair), 17.8 parsecs (58 ly) away. It consists of two main sequence stars, each a little hotter and more luminous than the Sun.

Alpha Comae Berenices is said to represent the crown worn by Queen Berenice. The two components are designated Alpha Comae Berenices A (officially named Diadem /ˈdaɪədɛm/, the traditional name for the system) and B.

Nomenclature

α Comae Berenices (Latinised to Alpha Comae Berenices) is the system's Bayer designation. The designations of the two components as Alpha Comae Berenices A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).

The system bore the traditional names Diadem and Al Dafirah, the latter derived from the Arabic الضفيرة ađ̧-đ̧afīrah "the braid". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name Diadem for the component Alpha Comae Berenices A on 1 February 2017 and it is now so included in the List of IAU-approved Star Names.

In Chinese, 太微左垣 (Tài Wēi Zuǒ Yuán), meaning Left Wall of Supreme Palace Enclosure, refers to an asterism consisting of Alpha Comae Berenices, Eta Virginis, Gamma Virginis, Delta Virginis and Epsilon Virginis. Consequently, the Chinese name for Alpha Comae Berenices itself is 太微左垣五 (Tài Wēi Zuǒ Yuán wǔ, English: the Fifth Star of Left Wall of Supreme Palace Enclosure.), representing 東上將 (Dōngshǎngjiāng), meaning The First Eastern General. 東上將 (Dōngshǎngjiāng), westernized into Shang Tseang, but that name was designated for "v Comae Berenices" by R.H. Allen and the meaning is "a Higher General".

Properties

Although Alpha Comae Berenices bears the title "alpha", at magnitude 4.32 it is actually fainter than Beta Comae Berenices.

It is a binary star, with almost equal components of magnitudes 5.05 m and 5.08 m orbiting each other with a period of 25.87 years. The system, estimated to be 58 light-years distant, appears so nearly "edge-on" from the Earth that the two stars appear to move back-and-forth in a straight line with a maximum separation of only 0.7 arcsec. Eclipses are predicted to occur between the two components however they have not been successfully observed due to miscalculations of the time of eclipse.

The mean separation between them is approximately 10 AU, about the distance between the Sun and Saturn.

The binary star has a visual companion, CCDM J13100+1732C, of apparent magnitude 10.2, located 89 arcseconds away along a position angle of 345°.

Alpha Comae Berenicis forms an isosceles triangle with globular star clusters Messier 53 and NGC 5053. The apparent diameter of this triangle is a little more than one degree. The location of Alpha Comae Berenicis is westward (preceding) of both globular star clusters.

References

  1. ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. NSV 6116, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 3, 2008.
  3. Entry 13100+1732, Sixth Catalog of Orbits of Visual Binary Stars Archived 2005-04-24 at the Wayback Machine, United States Naval Observatory. Accessed on line September 3, 2008.
  4. Diadem Archived 2008-05-11 at the Wayback Machine, Jim Kaler, Stars. Accessed on line September 3, 2008.
  5. ^ HR 4968, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 3, 2008.
  6. ^ NSV 6116 -- Variable Star, database entry, SIMBAD. Accessed on line September 3, 2008.
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  18. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
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  21. Richard Hinckley Allen: Star Names — Their Lore and Meaning: Coma Berenices
  22. Entry 13100+1732, discoverer code STF1728, components AB-C, The Washington Double Star Catalog Archived 2008-04-13 at the Wayback Machine, United States Naval Observatory. Accessed on line September 3, 2008.

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