9983 Rickfienberg

9983 Rickfienberg, provisional designation 1995 DA, is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 19 February 1995, by American astronomer Dennis di Cicco at his private Sudbury Observatory (817), Massachusetts, United States.[9] It was named after American astronomer and editor Richard Fienberg.[2]

9983 Rickfienberg
Orbit of Rickfienberg (blue), the inner planets and Jupiter (outermost)
Discovery [1]
Discovered byDennis di Cicco
Discovery siteSudbury Obs. (817)
Discovery date19 February 1995
MPC designation(9983) Rickfienberg
Named after
Richard Fienberg
(astronomer, editor)[2]
1995 DA · 1987 KS2
1993 TS37
main-belt · (middle)
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc30.02 yr (10,963 days)
Aphelion3.0191 AU
Perihelion2.3962 AU
2.7076 AU
4.46 yr (1,627 days)
0° 13m 16.32s / day
Physical characteristics
Dimensions7.444±0.280 km[3][4]
12.18 km (calculated)[5]
5.29616±0.00001 h[6]
5.2963±0.0001 h[7]
0.057 (assumed)[5]
13.2[3] · 13.3[1][5] · 13.79±0.76[8]


Rickfienberg is a dark C-type asteroid that orbits the Sun in the middle main-belt at a distance of 2.4–3.0 AU once every 4 years and 5 months (1,627 days). Its orbit has an eccentricity of 0.12 and an inclination of 8° with respect to the ecliptic.[1] The first observation was taken at the Australian Siding Spring Observatory in 1987, extending the asteroid's observation arc by 8 years prior to its discovery.[9]

Physical characteristicsEdit


During the asteroid's opposition in November 2011, a rotational lightcurve was obtained from photometric observations at Kitt Peak Observatory. It gave a well-defined rotation period of 5.2963 hours with a high brightness variation of 1.3 in magnitude (U=3), typically indicating a non-spheroidal shape.[7] This period was also confirmed by remodeled data from the Lowell photometric database in March 2016.[6]

Diameter and albedoEdit

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Rickfienberg measures 7.4 kilometers in diameter and its surface has an albedo of 0.17,[3][4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 12.2 kilometers, as the lower the body's albedo (reflectivity), the larger its diameter, at a constant absolute magnitude (brightness).[5]


This minor planet was named for Richard Tresch Fienberg (born 1956) an American astronomer at Rice and Harvard universities, and a stargazer at his private observatory near Danbury, New Hampshire. He is also an editor of the American amateur astronomer magazine Sky & Telescope, after which the minor planet 3243 Skytel is named.[2] The official naming citation was published by the Minor Planet Center on 1 May 2003 (M.P.C. 48389).[10]


  1. ^ a b c d "JPL Small-Body Database Browser: 9983 Rickfienberg (1995 DA)" (2017-06-04 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2006). "(9983) Rickfienberg [2.71, 0.11, 8.3]". Dictionary of Minor Planet Names – (9983) Rickfienberg, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 49. doi:10.1007/978-3-540-34361-5_396. ISBN 978-3-540-34361-5.
  3. ^ a b c d 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. Retrieved 1 August 2016.
  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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016.
  5. ^ a b c d e "LCDB Data for (9983) Rickfienberg". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2016.
  6. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 1 August 2016.
  7. ^ a b Tatge, Coty B.; Odden, Caroline, E.; Arion, Douglas N.; Feinberg, Richard Tresch (July 2012). "Spectrophotometric Classification and Lightcurve Analysis of 9983 Rickfienberg". The Minor Planet Bulletin. 39 (3): 135–136. Bibcode:2012MPBu...39..135T. ISSN 1052-8091. Retrieved 1 August 2016.
  8. ^ 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 1 August 2016.
  9. ^ a b "9983 Rickfienberg (1995 DA)". Minor Planet Center. Retrieved 1 August 2016.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 1 August 2016.

External linksEdit