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1925 Franklin-Adams

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Main-belt asteroid

1925 Franklin-Adams
Franklin-Adams modeled from its lightcurve
Discovery
Discovered byH. van Gent
Discovery siteJohannesburg Obs.
(Leiden Southern Station)
Discovery date9 September 1934
Designations
MPC designation(1925) Franklin-Adams
Named afterJohn Franklin Adams
(British astronomer)
Alternative designations1934 RY · 1969 EP1
1970 KH · 1974 KK
Minor planet categorymain-belt · (middle)
background
Orbital characteristics
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc85.14 yr (31,098 d)
Aphelion2.9989 AU
Perihelion2.1046 AU
Semi-major axis2.5517 AU
Eccentricity0.1752
Orbital period (sidereal)4.08 yr (1,489 d)
Mean anomaly11.630°
Mean motion0° 14 30.48 / day
Inclination7.7371°
Longitude of ascending node113.47°
Argument of perihelion242.08°
Physical characteristics
Mean diameter8.864±0.114 km
Synodic rotation period2.978±0.002 h
Geometric albedo0.356±0.054
Spectral typeS (assumed)
Absolute magnitude (H)12.0
12.1

1925 Franklin-Adams (prov. designation: 1934 RY) is a stony background asteroid from the central regions of the asteroid belt, approximately 8.9 kilometers (5.5 miles) in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. The bright asteroid has a short rotation period of less than 3 hours. It was named after British amateur astronomer John Franklin Adams (1843–1912).

Orbit and classification

Franklin-Adams is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. It orbits the Sun in the central asteroid belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,489 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.18 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Johannesburg.

Naming

This minor planet named after British amateur astronomer John Franklin Adams (1843–1912), who created one of the earliest detailed, photographic atlases of the complete night sky (the Franklin-Adams plates or charts). He later donated his 25-cm Franklin-Adams Star Camera (Franklin-Adams photographic refractor) to the Johannesburg Observatory, which lead to the discovery of Proxima Centauri. The official naming citation was published by the Minor Planet Center on 20 December 1983 (M.P.C. 8402). Asteroid 982 Franklina, discovered by South African astronomer Harry Edwin Wood at Johannesburg was also named after him.

Physical characteristics

Franklin-Adams is an assumed stony S-type asteroid with a very high albedo of more than 0.3 (see below).

Rotation period and poles

In January 2005, a rotational lightcurve of Franklin-Adams was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 3.082 hours with a brightness amplitude of 0.23 magnitude (U=2). In March 2010, photometry at the Palomar Transient Factory in California gave a period of 2.979 with an amplitude of 0.32 magnitude (U=2). In January 2013, American astronomer Brian Warner obtained the so-far best rated lightcurve. It gave a period of 2.978 hours and an amplitude of 0.25 magnitude (U=3).

In 2016, an international study modeled a lightcurve with a concurring period of 2.978301 hours and found a spin axis of (277.0°, 57.0°) and (66.0°, 48.0°) in ecliptic coordinates (λ, β) (U=n.a.).

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Franklin-Adams measures 8.864 kilometers in diameter and its surface has an unusually high albedo of 0.356, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.30 kilometers based on an absolute magnitude of 12.1.

Notes

  1. ^ Lightcurve plot of 1925 Franklin-Adams with a period of 2.978±0.002 and an amplitude of 0.25 ± 0.02 mag. Observations at the Palmer Divide Observatory by B. D. Warner (2013)

References

  1. ^ "1925 Franklin-Adams (1934 RY)". Minor Planet Center. Retrieved 8 February 2020.
  2. ^ Schmadel, Lutz D. (2007). "(1925) Franklin-Adams". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 155. doi:10.1007/978-3-540-29925-7_1926. ISBN 978-3-540-00238-3.
  3. ^ "JPL Small-Body Database Browser: 1925 Franklin-Adams (1934 RY)" (2019-10-31 last obs.). Jet Propulsion Laboratory. Retrieved 8 February 2020.
  4. ^ "Asteroid 1925 Franklin-Adams – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 8 February 2020.
  5. ^ "Asteroid 1925 Franklin-Adams". Small Bodies Data Ferret. Retrieved 8 February 2020.
  6. ^ Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 21 March 2017.
  7. ^ Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  8. ^ Warner, Brian D. (July 2013). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2013 January - March". The Minor Planet Bulletin. 40 (3): 137–145. Bibcode:2013MPBu...40..137W. ISSN 1052-8091. Retrieved 9 June 2017.
  9. ^ "LCDB Data for (1925) Franklin-Adams". Asteroid Lightcurve Database (LCDB). Retrieved 8 February 2020.
  10. "The Internet Encyclopedia of Science". David Darling. Archived from the original on 22 March 2017.
  11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 June 2017.
  12. Behrend, Raoul. "Asteroids and comets rotation curves – (1925) Franklin-Adams". Geneva Observatory. Retrieved 9 June 2017.
  13. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 9 June 2017.
  14. Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.

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