1925 Franklin-Adams

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1925 Franklin-Adams
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 9 September 1934
MPC designation (1925) Franklin-Adams
Named after
John Franklin-Adams (amateur astronomer)[2]
1934 RY · 1969 EP1
1970 KH · 1974 KK
main-belt[1][3] · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 82.56 yr (30,154 days)
Aphelion 3.0026 AU
Perihelion 2.0993 AU
2.5510 AU
Eccentricity 0.1770
4.07 yr (1,488 days)
0° 14m 30.84s / day
Inclination 7.7330°
Physical characteristics
Dimensions 8.864±0.114[4][5]
11.30 km (calculated)[6]
2.978±0.002 h[7][a]
2.978301±0.000005 h[8]
2.979±0.0004 h[9]
3.082±0.003 h[10]
0.20 (assumed)[6]
12.0[5] · 12.1[1][6] · 12.158±0.002 (R)[9] · 12.38±0.28[11]

1925 Franklin-Adams, provisional designation 1934 RY, is a stony asteroid from the central regions of the asteroid belt, approximately 9 kilometers 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.[3] The asteroid was named after English amateur astronomer John Franklin-Adams.[2]

Orbit and classification[edit]

Franklin-Adams orbits the Sun in the central main-belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,488 days). Its orbit has an eccentricity of 0.18 and an inclination of 8° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Johannesburg.[3]

Physical characteristics[edit]

Franklin-Adams has been characterized as a common stony S-type asteroid.[6]

Rotation period[edit]

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).[10] 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).[9]

In January 2013, American astronomer Brian Warner obtained the so-far best rated lightcurve.[a] It gave a period of 2.978 hours and an amplitude of 0.25 magnitude (U=3).[7]

Spin axis[edit]

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.).[8]

Diameter and albedo[edit]

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 albedo of 0.356,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.30 kilometers with an absolute magnitude of 12.1.[6]


This minor planet named after English 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).[12] 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.[2]

The official naming citation was published by the Minor Planet Center on 20 December 1983 (M.P.C. 8402).[13]


  1. ^ a b 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)


  1. ^ a b c d e "JPL Small-Body Database Browser: 1925 Franklin-Adams (1934 RY)" (2017-03-31 last obs.). Jet Propulsion Laboratory. Retrieved 9 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1925) Franklin-Adams. Springer Berlin Heidelberg. p. 155. ISBN 978-3-540-00238-3. Retrieved 21 March 2017. 
  3. ^ a b c "1925 Franklin-Adams (1934 RY)". Minor Planet Center. Retrieved 21 March 2017. 
  4. ^ a b c 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 21 March 2017. 
  5. ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 9 June 2017. 
  6. ^ a b c d e f "LCDB Data for (1925) Franklin-Adams". Asteroid Lightcurve Database (LCDB). Retrieved 21 March 2017. 
  7. ^ a b 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. 
  8. ^ a b 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" (PDF). Astronomy and Astrophysics. 586: 24. arXiv:1510.07422Freely accessible. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 9 June 2017. 
  9. ^ a b c 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 9 June 2017. 
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1925) Franklin-Adams". Geneva Observatory. Retrieved 9 June 2017. 
  11. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 9 June 2017. 
  12. ^ "The Internet Encyclopedia of Science". David Darling. Retrieved 21 March 2017. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 June 2017. 

External links[edit]