1621 Druzhba

Last updated

1621 Druzhba
001621-asteroid shape model (1621) Druzhba.png
Shape model of Druzhba from its lightcurve
Discovery [1]
Discovered by S. Belyavskyj
Discovery site Simeiz Obs.
Discovery date1 October 1926
Designations
(1621) Druzhba
Named after
дружба – lit. 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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 90.49 yr (33,052 days)
Aphelion 2.4948 AU
Perihelion 1.9650 AU
2.2299 AU
Eccentricity 0.1188
3.33 yr (1,216 days)
73.187°
0° 17m 45.6s / day
Inclination 3.1730°
181.88°
238.14°
Physical characteristics
Dimensions 9.05 km (derived) [3]
9.08±0.8 km [4]
11.70±0.20 km [5]
12.694±0.296 km [6]
12 h (dated) [7]
47.9±0.5 h (dated) [8]
99.100±0.005 h [9]
99.20±0.03 h [10]
0.2373±0.046 [4]
0.243 (derived) [3]
0.244±0.039 [6]
0.312±0.012 [5]
Tholen = S [1]  · S [3] [11]
B–V = 0.898 [1]
U–B = 0.503 [1]
11.63 [1] [5] [6]  ·12.37±0.09 [3] [7] [12]  ·12.39 [4]  ·12.53±0.29 [11]

    1621 Druzhba (provisional designation 1926 TM), is a stony Florian asteroid and relatively slow rotator from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 1 October 1926, by Russian astronomer Sergey Belyavsky at Simeiz Observatory on the Crimean peninsula. [13] It was named after the Russian word for friendship. [2]

    Contents

    Classification and orbit

    Druzhba is a member of the Flora family, one of the largest collisional 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 has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic. [1] Druzhba's observation arc begins at the discovering observatory, one week after its official discovery observation. [13]

    Physical characteristics

    In the Tholen classification, Druzhba is a common S-type asteroid. [1]

    Rotation period

    In August 2009, American amateur astronomer Robert D. Stephens obtained a rotational lightcurve of Druzhba from photometric observations. In gave a well-defined rotation period of 99.20 hours with a change in brightness of 0.75 magnitude ( U=3 ) [10] A 2016-published modeled light-curve of 99.100 hours concurred with the result. [9]

    This makes it a relatively slow rotator, as the vast majority of minor planets rotate every 2 to 20 hours around their axis. Druzhba's long rotation period was particularly difficulty to measure: Previously, observations by Richard Ditteon at Oakley Observatory gave a period solution of 47.9 hours (Δmag 1.0; U=1 ), [8] while Polish astronomer Wiesław Wiśniewski obtained a period of only 12 hours in the late 1980s (Δmag 0.16; U=1 ). [7]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Druzhba measures between 9.08 and 12.69 kilometers in diameter, and its surface has an albedo between 0.237 and 0.312. [4] [6] [5]

    Based on an absolute magnitude of 12.37, the Collaborative Asteroid Lightcurve Link derives a diameter of 9.05 kilometers and an albedo of 0.243 – similar to the albedo of 8 Flora, the family's largest member and namesake. [3]

    Naming

    This minor planet was named Druzhba , this is a Slavic word for friendship and the name of several cities, towns and other localities in Russia, Ukraine, Bulgaria and Kazakhstan. The asteroid's name was proposed by the Institute of Theoretical Astronomy in St. Petersburg. [2] The official naming citation was published by the Minor Planet Center on 1 June 1967 ( M.P.C. 2740). [14]

    Related Research Articles

    <span class="mw-page-title-main">96 Aegle</span> Main-belt asteroid

    96 Aegle is a carbonaceous asteroid and the namesake of the Aegle family located in the outer regions of the asteroid belt, approximately 170 kilometers in diameter. It was discovered on 17 February 1868, by French astronomer Jérôme Coggia at the Marseille Observatory in southeastern France. The rare T-type asteroid has a rotation period of 13.8 hours and has been observed several times during occultation events. It was named after Aegle ("brightness"), one of the Hesperides from Greek mythology.

    458 Hercynia, provisional designation 1900 FK, is a background asteroid from the outer regions of the asteroid belt, approximately 38 kilometers in diameter. It was discovered on 21 September 1900, by astronomers Max Wolf and Arnold Schwassmann at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named for the ancient Hercynian Forest, known to the Romans as "Hercynia silva".

    797 Montana, provisional designation 1914 VR, is a stony asteroid from the middle region of the asteroid belt, approximately 22 kilometers in diameter. It was discovered on 17 November 1914, by Danish astronomer Holger Thiele at Bergedorf Observatory in Hamburg, Germany. It was later named for the discovering observatory.

    1834 Palach, provisional designation 1969 QP, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 19 kilometers in diameter. It was discovered on 22 August 1969 by Czech astronomer Luboš Kohoutek at Bergedorf Observatory in Hamburg, Germany, and named after Czech student Jan Palach.

    1018 Arnolda, provisional designation 1924 QM, is a stony asteroid from the central regions of the asteroid belt, approximately 16 kilometers in diameter. It was discovered on 3 March 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after physicist Arnold Berliner.

    <span class="mw-page-title-main">1032 Pafuri</span> Dark background asteroid from the outer regions of the asteroid belt

    1032 Pafuri, provisional designation 1924 SA, is a dark background asteroid from the outer regions of the asteroid belt, approximately 65 kilometers in diameter. It was discovered on 30 May 1924, by English astronomer Harry Edwin Wood at the Union Observatory in Johannesburg, South Africa. The asteroid was named for the river in the Pafuri Triangle in South Africa, created by the confluence of the Limpopo and Levubu rivers. The body's spectral type and rotation period are still poorly determined.

    <span class="mw-page-title-main">1046 Edwin</span> Background asteroid

    1046 Edwin, provisional designation 1924 UA, is a background asteroid from the outer regions of the asteroid belt, approximately 30 kilometers kilometers in diameter. It was discovered on 1 December 1924, by Belgian–American astronomer George Van Biesbroeck at the Yerkes Observatory in Wisconsin, United States, who named it after his son, Edwin Van Biesbroeck. The potentially metallic asteroid has a short rotation period of 5.29 hours.

    1550 Tito, provisional designation 1937 WD, is a stony asteroid from the middle region of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 29 November 1937, by Serbian astronomer Milorad B. Protić at the Belgrade Astronomical Observatory in Serbia. It was named for Yugoslavian statesman Josip Broz Tito.

    <span class="mw-page-title-main">1132 Hollandia</span> Asteroid

    1132 Hollandia, provisional designation 1929 RB1, is a stony asteroid from the middle region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 13 September 1929, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named for the region Holland in the Netherlands.

    1162 Larissa, provisional designation 1930 AC, is a metallic Hildian asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers in diameter. It was discovered on 5 January 1930, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named after the Greek city of Larissa.

    (9992) 1997 TG19 is a stony asteroid and eccentric Mars-crosser, approximately 4 kilometers in diameter. It was discovered on 8 October 1997, by Japanese astronomers Tetsuo Kagawa and Takeshi Urata at Gekko Observatory near Shizuoka, Japan.

    1736 Floirac, provisional designation 1967 RA, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8.7 kilometer in diameter.

    1384 Kniertje, provisional designation 1934 RX, is a dark Adeonian asteroid from the central regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Union Observatory in Johannesburg, South Africa. The asteroid was named after a character in the Dutch play Op Hoop van Zegen by Herman Heijermans.

    1505 Koranna, provisional designation 1939 HH, is a stony Eunomia asteroid from the central regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 21 April 1939, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was named for the native Koranna people of South Africa.

    4804 Pasteur, provisional designation 1989 XC1, is a carbonaceous background asteroid from the central regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 2 December 1989, by Belgian astronomer Eric Elst at the ESO's La Silla Observatory in Chile. The asteroid was named after French chemist and microbiologist Louis Pasteur.

    1359 Prieska, provisional designation 1935 OC, is a rare-type carbonaceous asteroid from the outer region of the asteroid belt, approximately 50 kilometers in diameter. It was discovered on 22 July 1935, by English-born South-African astronomer Cyril Jackson at Johannesburg Observatory in South Africa. The asteroid was named after the South African town of Prieska.

    1297 Quadea, provisional designation 1934 AD, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 7 January 1934, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid was named for the parents-in-law of the discoverer's brother.

    <span class="mw-page-title-main">1186 Turnera</span> Eoan asteroid

    1186 Turnera, provisional designation 1929 PL, is a stony Eoan asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered on 1 August 1929, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was later named after British astronomer Herbert Hall Turner.

    5176 Yoichi is a background asteroid from the central regions of the asteroid belt, approximately 17 kilometers in diameter. It was discovered on 4 January 1989, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaido, Japan. The likely elongated asteroid has a brightness variation of 0.45 magnitude, and occulted a star in the constellation Cetus in November 2014. It was named for the Japanese town of Yoichi.

    1558 Järnefelt, provisional designation 1942 BD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 65 kilometers in diameter.

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1621 Druzhba (1926 TM)" (2017-03-29 last obs.). Jet Propulsion Laboratory . Retrieved 4 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1621) Druzhba". Dictionary of Minor Planet Names – (1621) Druzhba. Springer Berlin Heidelberg. p. 128. doi:10.1007/978-3-540-29925-7_1622. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (1621) Druzhba". Asteroid Lightcurve Database (LCDB). Retrieved 28 December 2016.
    4. 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T . Retrieved 17 October 2019.
    5. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; 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 . (online, AcuA catalog p. 153)
    6. 1 2 3 4 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; 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 28 December 2016.
    7. 1 2 3 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. 26: 1511. Bibcode:1995LPI....26.1511W . Retrieved 28 December 2016.
    8. 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 28 December 2016.
    9. 1 2 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. arXiv: 1510.07422 . Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
    10. 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 28 December 2016.
    11. 1 2 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 28 December 2016.
    12. ↑ Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026 . Retrieved 28 December 2016.
    13. 1 2 "1621 Druzhba (1926 TM)". Minor Planet Center. Retrieved 28 December 2016.
    14. ↑ Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN   978-3-642-01964-7.
    This page is based on this Wikipedia article
    Text is available under the CC BY-SA 4.0 license; additional terms may apply.
    Images, videos and audio are available under their respective licenses.