Astronomy:1925 Franklin-Adams

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1925 Franklin-Adams
001925-asteroid shape model (1925) Franklin-Adams.png
Franklin-Adams modeled from its lightcurve
Discovery[1]
Discovered byH. van Gent
Discovery siteJohannesburg Obs.
(Leiden Southern Station)
Discovery date9 September 1934
Designations
(1925) Franklin-Adams
Named afterJohn Franklin Adams
(British astronomer)[2]
1934 RY · 1969 EP1
1970 KH · 1974 KK
Minor planet categorymain-belt[1][3] · (middle)
background[4][5]
Orbital characteristics[3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc85.14 yr (31,098 d)
|{{{apsis}}}|helion}}2.9989 AU
|{{{apsis}}}|helion}}2.1046 AU
2.5517 AU
Eccentricity0.1752
Orbital period4.08 yr (1,489 d)
Mean anomaly11.630°
Mean motion0° 14m 30.48s / day
Inclination7.7371°
Longitude of ascending node113.47°
242.08°
Physical characteristics
Mean diameter8.864±0.114 km[6][7]
Rotation period2.978±0.002 h[5][8][lower-alpha 1]
Geometric albedo0.356±0.054[6][7]
S (assumed)[9]
Absolute magnitude (H)12.0[7]
12.1[1][3]


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.[1] The bright asteroid has a short rotation period of less than 3 hours.[5] It was named after British amateur astronomer John Franklin Adams (1843–1912).[2]

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.[4] 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.[3] The body's observation arc begins with its official discovery observation at Johannesburg.[1]

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).[10] 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).[11] 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).[5][9]

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 ({{{1}}}).[12] In March 2010, photometry at the Palomar Transient Factory in California gave a period of 2.979 with an amplitude of 0.32 magnitude ({{{1}}}).[13] In January 2013, American astronomer Brian Warner obtained the so-far best rated lightcurve.[lower-alpha 1] It gave a period of 2.978 hours and an amplitude of 0.25 magnitude ({{{1}}}).[8]

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) ({{{1}}}).[14]

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,[6] 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.[9]

Notes

  1. ↑ 1.0 1.1 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. ↑ 1.0 1.1 1.2 1.3 1.4 "1925 Franklin-Adams (1934 RY)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1925. 
  2. ↑ 2.0 2.1 2.2 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. https://archive.org/details/dictionaryminorp00schm. 
  3. ↑ 3.0 3.1 3.2 3.3 "JPL Small-Body Database Browser: 1925 Franklin-Adams (1934 RY)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001925. 
  4. ↑ 4.0 4.1 "Asteroid 1925 Franklin-Adams – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1925. 
  5. ↑ 5.0 5.1 5.2 5.3 "Asteroid 1925 Franklin-Adams". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1925+Franklin-Adams. 
  6. ↑ 6.0 6.1 6.2 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 21 March 2017. 
  7. ↑ 7.0 7.1 7.2 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  8. ↑ 8.0 8.1 Warner, Brian D. (July 2013). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2013 January - March". The Minor Planet Bulletin 40 (3): 137–145. ISSN 1052-8091. Bibcode: 2013MPBu...40..137W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..137W. Retrieved 9 June 2017. 
  9. ↑ 9.0 9.1 9.2 "LCDB Data for (1925) Franklin-Adams". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/lcdbsummaryquery.php. 
  10. ↑ "The Internet Encyclopedia of Science". David Darling. http://www.daviddarling.info/encyclopedia/F/Franklin-Adams_charts.html. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. 
  12. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (1925) Franklin-Adams". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001925. 
  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. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. 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. doi:10.1051/0004-6361/201527441. Bibcode: 2016A&A...586A.108H. 

External links



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