1621 Druzhba
| Discovery [1] | |
|---|---|
| Discovered by | S. Belyavskyj |
| Discovery site | Simeiz Observatory |
| Discovery date | 1 October 1926 |
| Designations | |
| MPC designation | 1621 Druzhba |
Named after |
дружба (friendship in Russian)[2] |
|
1926 TM · 1927 AE 1931 EO · 1946 UH 1949 QS1 · 1951 EK1 1951 ER1 · 1958 GA 1979 QP4 | |
| main-belt · Flora [3] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 88.95 yr (32490 days) |
| Aphelion | 2.4956 AU (373.34 Gm) |
| Perihelion | 1.9646 AU (293.90 Gm) |
| 2.2301 AU (333.62 Gm) | |
| Eccentricity | 0.11905 |
| 3.33 yr (1216.4 d) | |
| 255.58° | |
| 0° 17m 45.42s / day | |
| Inclination | 3.1727° |
| 181.89° | |
| 238.18° | |
| Earth MOID | 0.978087 AU (146.3197 Gm) |
| Jupiter MOID | 2.79168 AU (417.629 Gm) |
| Jupiter Tisserand parameter | 3.631 |
| Physical characteristics | |
| Dimensions |
9.08 km[4] 11.70±0.20 km[5] 12.69±0.30 km[6] 9.05 km (derived)[3] |
Mean radius | 4.54 ± 0.4 km |
|
99.20 h (4.133 d)[1][7] 12 h[8] 47.9±0.5 h[9] | |
|
0.2373[4] 0.312±0.012[5] 0.244±0.039[6] 0.243 (derived)[3] 0.2373 ± 0.046[1] | |
|
B–V = 0.898 U–B = 0.503 Tholen = S S [3] | |
| 11.63 | |
|
| |
1621 Druzhba, provisional designation 1926 TM, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 9 kilometers in diameter. It was discovered by Russian astronomer Sergey Belyavsky at the Crimean Simeiz Observatory on 1 October 1926.[10]
The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,216 days). Its orbit shows an eccentricity of 0.12 and is tilted by 3 degrees to the plane of the ecliptic. It has an albedo between 0.2 and 0.3, based on the surveys carried out by IRAS, Akari, and WISE/NEOWISE.[4][5][6]
Photometric observations made in 2006 at the Oakley Observatory in Terre Haute, Indiana, found a light curve period of 47.9±0.5 hours, with variation in brightness of less than one magnitude.[9] In 2010, observations were made at the Goat Mountain Astronomical Research Station in Rancho Cucamonga, California, gave a period estimate of 47.9 hours, although this may be a half rotation period instead (99.2 hours).[7] The long rotation period makes accurate estimates more difficult to obtain, so further data is needed to reduce the margin of error.
It was named Druzhba, the is a Slavic word for friendship and the name of several cities, towns and other localities in Ukraine, Russia, Bulgaria and Kazakhstan. The asteroid's name was proposed by the Institute of Theoretical Astronomy in St. Petersburg.[2]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 1621 Druzhba (1926 TM)" (2015-09-14 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1621) Druzhba. Springer Berlin Heidelberg. p. 128. ISBN 978-3-540-29925-7. Retrieved 15 November 2015.
- 1 2 3 4 "LCDB Data for (1621) Druzhba". Asteroid Lightcurve Database (LCDB). Retrieved 15 November 2015.
- 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 15 November 2015.
- 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 15 November 2015.
- 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794
. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 15 November 2015. - 1 2 Stephens, Robert D. (January 2010). "Asteroids Observed from GMARS and Santana Observatories: 2009 June - September". The Minor Planet Bulletin. 37 (1): 28–29. Bibcode:2010MPBu...37...28S. ISSN 1052-8091. Retrieved 15 November 2015.
- ↑ Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. Bibcode:1995LPI....26.1511W. Retrieved 15 November 2015.
- 1 2 Ditteon, Richard; Hawkins, Scot (September 2007). "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006". The Minor Planet Bulletin. 34 (3): 59–64. Bibcode:2007MPBu...34...59D. ISSN 1052-8091. Retrieved 15 November 2015.
- ↑ "1621 Druzhba (1926 TM)". Minor Planet Center. Retrieved 15 November 2015.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1621 Druzhba at the JPL Small-Body Database
