1817 Katanga, provisional designation 1939 MB, is a stony Phocaea asteroid in from the inner regions of the asteroid belt, approximately 16 kilometers in diameter. It was discovered on 20 June 1939, by English-born South African astronomer Cyril Jackson at Johannesburg Observatory in South Africa.[10] It is named for the Katanga Province.[2]

1817 Katanga
Discovery [1]
Discovered byC. Jackson
Discovery siteJohannesburg Obs.
Discovery date20 June 1939
MPC designation(1817) Katanga
Named after
Katanga Province
(Congo, Dem. Rep.)[2]
1939 MB · 1928 KD
1950 NK · 1971 BG
main-belt · Phocaea[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc77.58 yr (28,337 days)
Aphelion2.8258 AU
Perihelion1.9172 AU
2.3715 AU
3.65 yr (1,334 days)
0° 16m 11.64s / day
Physical characteristics
Dimensions9.76±1.21 km[4]
15.89±1.56 km[5]
15.90±1.0 km (IRAS:14)[6]
16.28 km (derived)[3]
6.35±0.02 h[7]
7.2165±0.0003 h[8]
8.481±0.003 h[9]
0.1331±0.018 (IRAS:14)[6]
0.2421 (derived)[3]
10.78[5] · 11.1[1][3] · 11.80[4][6] ·

Orbit and classificationEdit

The S-type asteroid is a member of the Phocaea family, a smaller population of asteroids with similar orbital characteristics named after their largest member, 25 Phocaea. Katanga orbits the Sun in the inner main-belt at a distance of 1.9–2.8 AU once every 3 years and 8 months (1,334 days). Its orbit has an eccentricity of 0.19 and an inclination of 26° with respect to the ecliptic.[1] Katanga's observation arc begins with its official discovery observation in 1939, as its first observation made at Heidelberg Observatory in 1928, remained unused (1928 KD).[10]


In April 2008, a rotational lightcurve of Katanga was obtained from photometric observations by American astronomer Brian D. Warner at his Palmer Divide Observatory in Colorado. It gave a rotation period of 8.481 hours with a brightness variation of 0.30 magnitude (U=3).[9] The quality of this result supersedes two periods previously obtained by astronomers Stefano Sposetti and Glenn Malcolm in May and June 2001, respectively (U=2/2).[7][8]

Diameter and albedoEdit

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, Katanga measures between 9.76 and 15.90 kilometers in diameter, and its surface has an albedo between 0.133 and 0.353.[4][5][6] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.242 and a diameter of 16.28 kilometers with an absolute magnitude of 11.1.[3]


This minor planet was named after the Katanga Province, a rich mining region in the Democratic Republic of the Congo in Central Africa.[2] The approved naming citation was published by the Minor Planet Center on 1 February 1980 (M.P.C. 5183).[11]


  1. ^ a b c d "JPL Small-Body Database Browser: 1817 Katanga (1939 MB)" (2017-01-18 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1817) Katanga". Dictionary of Minor Planet Names – (1817) Katanga. Springer Berlin Heidelberg. p. 145. doi:10.1007/978-3-540-29925-7_1818. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (1817) Katanga". Asteroid Lightcurve Database (LCDB). Retrieved 15 December 2016.
  4. ^ a b c d 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. Retrieved 17 October 2019. (online, AcuA catalog p. 153)
  5. ^ a b c d 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 15 December 2016.
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
  7. ^ a b Malcolm, G. (June 2002). "Rotational Periods and Lightcurves of 445 Edna, 1817 Katanga and 1847 Stobbe". The Minor Planet Bulletin. 29: 28–29. Bibcode:2002MPBu...29...28M. Retrieved 15 December 2016.
  8. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1817) Katanga". Geneva Observatory. Retrieved 15 December 2016.
  9. ^ a b Warner, Brian D. (October 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: February-May 2008". The Minor Planet Bulletin. 35 (4): 163–166. Bibcode:2008MPBu...35..163W. ISSN 1052-8091. Retrieved 15 December 2016.
  10. ^ a b "1817 Katanga (1939 MB)". Minor Planet Center. Retrieved 15 December 2016.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 December 2016.

External linksEdit