1621 Druzhba

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. 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.
    2. 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 November 2015.
    3. 1 2 3 4 "LCDB Data for (1621) Druzhba". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 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 November 2015.
    5. 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 November 2015.
    6. 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 November 2015.
    7. 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 November 2015.
    8. ↑ 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 November 2015.
    9. 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 November 2015.
    10. ↑ "1621 Druzhba (1926 TM)". Minor Planet Center. Retrieved November 2015.

    External links


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