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1 Camelopardalis

Location of 1 Camelopardalis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
1 Cam A
Right ascension	04 32 01.841
Declination	+53° 54′ 39.02″
Apparent magnitude (V)	5.77
1 Cam B
Right ascension	04 32 00.915
Declination	+53° 54′ 45.35″
Apparent magnitude (V)	6.803
Characteristics
1 Cam A
Spectral type	O9.7IIn
U−B color index	−0.73
B−V color index	+0.18
Variable type	SPB?
1 Cam B
Spectral type	B1IV:
U−B color index	−0.70
B−V color index	+0.16
Astrometry
1 Cam A
Proper motion (μ)	RA: +2.775 mas/yr Dec.: −3.783 mas/yr
Parallax (π)	1.2630 ± 0.0486 mas
Distance	2,580 ± 100 ly (790 ± 30 pc)
1 Cam B
Proper motion (μ)	RA: +0.775 mas/yr Dec.: −3.211 mas/yr
Parallax (π)	1.1211 ± 0.0462 mas
Distance	2,900 ± 100 ly (890 ± 40 pc)
Absolute magnitude (MV)	−5.53
Details
1 Cam A
Luminosity	4,365 L☉
Surface gravity (log g)	3.65 cgs
Temperature	29,800 K
Rotational velocity (v sin i)	275 km/s
1 Cam B
Luminosity	1,995 L☉
Temperature	29,512 K
Rotational velocity (v sin i)	11 km/s
Age	<20 Myr
Other designations
DL Camelopardalis, HR 1417, HD 28446, SAO 24672, BD+53°779, FK5 165, WDS J04320+5355, HIP 21148
Database references
SIMBAD	data
	1 Cam A
	1 Cam B

1 Camelopardalis (1 Cam) is a double star system in the constellation Camelopardalis. Its combined apparent magnitude is 5.56 and it is approximately 800 parsecs (2,600 ly) away. It is faintly visible to the naked eye under good observing conditions.

The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away. 1 Camelopardalis A is a hot massive star which has evolved away from the main sequence to become a giant. 1 Camelopardalis B is 10" away and is probably an early B class subgiant.

There is an 11th magnitude star 150" away. It has been considered to be a member of a triple system, but Gaia observations show it to be an unrelated background object.

In 1982, Mikołaj Jerzykiewicz and Christiaan L. Sterken reported that 1 Camelopardalis might be a variable star, but some subsequent studies failed to confirm that. Its brightness was convincingly shown to be variable when the Hipparcos data was analyzed. It was given its variable star designation, DL Camelopardalis, in 1999. 1 Camelopardalis A is a variable star with a small amplitude. It has a likely period of 0.22132 days and is thought to be a β Cephei variable or slowly pulsating B-type star. Hipparcos photometry shows an amplitude of 0.035 magnitudes. It has a rotational velocity of 275 km/s, one of the highest known.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
3. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
4. Sota, A; Apellániz, J. Maíz; Morrell, N. I; Barbá, R. H; Walborn, N. R; Gamen, R. C; Arias, J. I; Alfaro, E. J (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement Series. 211 (1): 10. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. S2CID 118847528.
5. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
6. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
7. Lutz, T. E; Lutz, J. H (1977). "Spectral classification and UBV photometry of bright visual double stars". The Astronomical Journal. 82: 431. Bibcode:1977AJ.....82..431L. doi:10.1086/112066.
8. ^ Westin, T. N. G. (1985). "The local system of early type stars - Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99. Bibcode:1985A&AS...60...99W.
9. ^ Holgado, G.; Simón-Díaz, S.; Haemmerlé, L.; Lennon, D. J.; Barbá, R. H.; Cerviño, M.; Castro, N.; Herrero, A.; Meynet, G.; Arias, J. I. (2020). "The IACOB project. VI. On the elusive detection of massive O-type stars close to the ZAMS". Astronomy and Astrophysics. 638: A157. arXiv:2005.05446. Bibcode:2020A&A...638A.157H. doi:10.1051/0004-6361/202037699. S2CID 218596165.
10. ^ Cazorla, Constantin; et al. (2017). "Chemical abundances of fast-rotating massive stars. I. Description of the methods and individual results". Astronomy and Astrophysics. 603: A56. arXiv:1703.05592. Bibcode:2017A&A...603A..56C. doi:10.1051/0004-6361/201629841. S2CID 59499133.
11. ^ Simón-Díaz, S.; Godart, M.; Castro, N.; Herrero, A.; Aerts, C.; Puls, J.; Telting, J.; Grassitelli, L. (2017). "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars". Astronomy and Astrophysics. 597: A22. arXiv:1608.05508. Bibcode:2017A&A...597A..22S. doi:10.1051/0004-6361/201628541. S2CID 3478126.
12. ^ Straižys, V.; Laugalys, V. (2007). "Young Stars in the Camelopardalis Dust and Molecular Clouds. I. The Cam OB1 Association". Baltic Astronomy. 16: 167–182. arXiv:0803.2461. Bibcode:2007BaltA..16..167S.
13. Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
14. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
15. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
16. Jerzykiewicz, M.; Sterken, C. (April 1982). Light variations in several broad-lined B stars, in: Be stars; Proceedings of the Symposium, Munich, West Germany, April 6-10, 1981. Vol. 98. Dordrecht, D. Reidel Publishing Co. pp. 49–51. Bibcode:1982IAUS...98...49J. Retrieved 30 December 2024.
17. Stagg, Ch. (August 1983). "An Investigation of Short Timescale Variability in 6 Early B Stars" (PDF). Information Bulletin on Variable Stars. 2376: 1–6. Bibcode:1983IBVS.2376....1S. Retrieved 30 December 2024.
18. Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K. Retrieved 30 December 2024.
19. Jerzykiewicz, M. (1993). "Three known and twenty-two new variable stars of early spectral type". Astronomy and Astrophysics Supplement Series. 97: 421. Bibcode:1993A&AS...97..421J.
20. Lefèvre, L; Marchenko, S. V; Moffat, A. F. J; Acker, A (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry" (PDF). Astronomy & Astrophysics. 507 (2): 1141. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304.

v t e Constellation of Camelopardalis
Camelopardalis in Chinese astronomy List of stars in Camelopardalis
Stars	Bayer α β γ Flamsteed 1 2 3 4 5 7 8 11 12 14 15 16 17 18 19 20 21 22 23 24 26 28 29 30 31 33 34 35 36 37 38 39 40 41 42 43 49 51 53 Variable U Z RU ST TX VZ BD BE BK BN CE CO CQ CS DD MY HR 967 1046 1073 1112 1124 1129 1138 1158 1192 1204 1205 1241 1242 1305 1313 1314 1327 1335 1342 1401 1440 1491 1527 1561 1624 1636 (Mago) 1675 1683 1686 1720 1844 1916 2209 2363 2396 2401 2527 2581 2830 3075 3082 3216 4062 4084 4609 (Tonatiuh) 4892 4893 5009 5091 5203 HD 35759 Other 2MASS J05325346+8246465 Gliese 445 NGC 2363-V1 PSR B0329+54 Stein 2051 Struve 1694 XO-3 XO-6
Exoplanets HD 32518 b HD 33564 b HD 104985 b XO-3b XO-6b
Star clusters NGC 1502
Nebulae IC 3568 (Lemon Slice Nebula) M4-18 NGC 1501 NGC 2404
Galaxies	NGC 1530 1560 1569 1573 1573A 1961 2146 2336 2363 2366 2403 2441 2460 2523 2655 2715 2748 5640 Other DDO 44 IC 342 IRAS 07598+6508 MACS0647-JD UGC 3478 UGC 3730 UGCA 86
Galaxy clusters MACS J0647.7+7015 MS 0735.6+7421
Astronomical events SN 1996ah GRB 970508 SN 2004dj SN 2010lt
Category

• Camelopardalis
• O-type bright giants
• Flamsteed objects
• Bright Star Catalogue objects
• Henry Draper Catalogue objects
• Objects with variable star designations
• B-type subgiants
• Beta Cephei variables
• Hipparcos objects
• Durchmusterung objects
• Binary stars