1187 Afra

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1187 Afra
001187-asteroid shape model (1187) Afra.png
Modelled shape of Afra from its lightcurve
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date6 December 1929
Designations
(1187) Afra
Named after
unknown [2]
1929 XC
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc 90.16 yr (32,932 d)
Aphelion 3.2285 AU
Perihelion 2.0523 AU
2.6404 AU
Eccentricity 0.2227
4.29 yr (1,567 d)
52.040°
0° 13m 46.92s / day
Inclination 10.697°
327.16°
74.956°
Physical characteristics
Mean diameter
  • 31.83±3.9  km [6]
  • 31.96±0.33 km [7]
  • 32.348±0.299 km [8]
  • 14.06993±0.00001  h [9]
  • 14.0701±0.0005 h [10]
  • 14.09±0.02 h [11]
  • 14.645±0.006 h [12]
SMASS = X [3]
11.50 [1] [3]

    1187 Afra (prov. designation: 1929 XC) is a dark background asteroid from the central regions of the asteroid belt. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 6 December 1929. [1] The X-type asteroid has a rotation period of 14.1 hours and measures approximately 32 kilometers (20 miles) in diameter. The origin of the asteroid's name remains unknown.

    Contents

    Orbit and classification

    Afra is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [4] [5] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.2  AU once every 4 years and 3 months (1,567 days; semi-major axis of 2.64 AU). Its orbit has an eccentricity of 0.22 and an inclination of 11° with respect to the ecliptic. [3] The body's observation arc begins at Heidelberg in January 1930, seven weeks after its official discovery observation. [1]

    Naming

    It is not known to what person, group of persons, or occurrence the name "Afra" refers to. [2]

    Unknown meaning

    Among the many thousands of named minor planets, Afra is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [13]

    Physical characteristics

    The lightcurve of Afra shows a periodicity of 14.09±0.02 hours, during which time the brightness of the object varies by 0.40±0.02 in magnitude. [11] [14]

    Related Research Articles

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    <span class="mw-page-title-main">868 Lova</span>

    868 Lova is a large and dark background asteroid, approximately 51 kilometers in diameter, from the central regions of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 26 April 1917. The carbonaceous C-type asteroid (Ch) and has a long rotation period of 41.1 hours and is likely elongated in shape. The origin of the asteroid's name remains unknown.

    <span class="mw-page-title-main">885 Ulrike</span>

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    931 Whittemora is a metallic background asteroid, approximately 46 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered by French astronomer François Gonnessiat at the Algiers Observatory in North Africa on 19 March 1920. The M-type asteroid has a rotation period of 19.2 hours. It was named after American archaeologist Thomas Whittemore (1871–1950).

    948 Jucunda is a background asteroid, approximately 17 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered on 3 March 1921, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid has a longer-than average rotation period of 26.2 hours. It was named after a common German female name, unrelated to the discoverer's contemporaries, that was taken from the almanac Lahrer Hinkender Bote.

    <span class="mw-page-title-main">979 Ilsewa</span>

    979 Ilsewa is a background asteroid from the outer regions of the asteroid belt, approximately 36 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 29 June 1922. The uncommon T-type asteroid has a longer-than average rotation period of 42.6 hours. It was named after Ilse Walldorf, an acquaintance of the discoverer.

    985 Rosina, provisional designation 1922 MO, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 14 October 1922, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.

    1048 Feodosia, provisional designation 1924 TP, is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 70 kilometers in diameter.

    <span class="mw-page-title-main">1116 Catriona</span>

    1116 Catriona is a carbonaceous asteroid from the outer regions of the asteroid belt, approximately 39 kilometers in diameter. It was discovered on 5 April 1929, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg. The asteroid was probably named after the 1893-novel Catriona by Robert Louis Stevenson.

    <span class="mw-page-title-main">1107 Lictoria</span>

    1107 Lictoria is a large Hygiea asteroid, approximately 79 kilometers in diameter, from the outer regions of the asteroid belt. It was discovered by Luigi Volta at the Pino Torinese Observatory in 1929, and named after the Fasces Lictores, Latin for "Fasci Littori", the symbol of the Italian fascist party.

    <span class="mw-page-title-main">1111 Reinmuthia</span> Very elongated asteroid from the background population

    1111 Reinmuthia is a very elongated asteroid from the background population, located in the outer region of the asteroid belt. It was discovered on 11 February 1927, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The F-type asteroid (FX) has a short rotation period of 4.02 hours and measures approximately 40 kilometers in diameter. It was later named in honor of Karl Reinmuth, the discoverer himself.

    <span class="mw-page-title-main">1126 Otero</span>

    1126 Otero, provisional designation 1929 AC, is a rare-type Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 11 January 1929, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. It was named after Spanish courtesan Carolina Otero.

    <span class="mw-page-title-main">1127 Mimi</span>

    1127 Mimi is a dark background asteroid from the central regions of the asteroid belt. It was discovered on 13 January 1929, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle. The carbonaceous C-type asteroids (CX) has a rotation period of 12.7 hours and measures approximately 47 kilometers in diameter. Through a glitch in the naming process, the asteroid received the name "Mimi" instead of "Robelmonte" as originally intended by the discoverer.

    <span class="mw-page-title-main">1137 Raïssa</span>

    1137 Raïssa is a stony background asteroid and slow rotator, approximately 22 kilometers in diameter, located in the inner regions of the asteroid belt. It was discovered by Grigory Neujmin at Simeiz Observatory in 1929, and named in memory of Raïssa Maseeva, who worked at the Pulkovo Observatory.

    1151 Ithaka, provisional designation 1929 RK, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered by Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in 1929, and later named for the Greek island of Ithaca.

    1394 Algoa, provisional designation 1936 LK, is a stony asteroid from the inner regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 12 June 1936, by English-born South-African astronomer Cyril Jackson at Union Observatory in Johannesburg, South Africa. The asteroid was named after the historical Algoa Bay.

    <span class="mw-page-title-main">1335 Demoulina</span>

    1335 Demoulina, provisional designation 1934 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by Karl Reinmuth at Heidelberg Observatory in 1934, the asteroid was named after Prof. Demoulin, a Belgian astronomer at Ghent University. It has a slower-than average spin rate of nearly 75 hours.

    1227 Geranium, provisional designation 1931 TD, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 46 kilometers in diameter. It was discovered on 5 October 1931, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid was named for the flowering plant Geranium (cranesbills).

    <span class="mw-page-title-main">1985 Hopmann</span>

    1985 Hopmann is a dark background asteroid in the outer regions of the asteroid belt. It was discovered on 13 January 1929, by astronomer Karl Reinmuth at Landessternwarte Heidelberg-Königstuhl in southern Germany. The asteroid has a rotation period of 17.5 hours and measures approximately 36 kilometers in diameter. It was later named after German astronomer Josef Hopmann (1890–1975).

    <span class="mw-page-title-main">1682 Karel</span>

    1682 Karel, provisional designation 1949 PH, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 7.5 kilometers in diameter.

    References

    1. 1 2 3 4 5 "1187 Afra (1929 XC)". Minor Planet Center. Retrieved 14 March 2020.
    2. 1 2 Schmadel, Lutz D. (2007). "(1187) Afra". Dictionary of Minor Planet Names . Springer Berlin Heidelberg. p.  100. doi:10.1007/978-3-540-29925-7_1188. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 "JPL Small-Body Database Browser: 1187 Afra (1929 XC)" (2020-02-04 last obs.). Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 14 March 2020.
    4. 1 2 "Asteroid 1187 Afra – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 14 March 2020.
    5. 1 2 "Asteroid 1187 Afra". Small Bodies Data Ferret. Retrieved 14 March 2020.
    6. 1 2 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 14 March 2020.
    7. 1 2 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)
    8. 1 2 Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M . Retrieved 14 March 2020.
    9. ↑ Ďurech, J.; Hanuš, J.; Oszkiewicz, D.; Vančo, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: A48. arXiv: 1601.02909 . Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. ISSN   0004-6361.
    10. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (1187) Afra". Geneva Observatory. Retrieved 14 March 2020.
    11. 1 2 Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory" (PDF). Minor Planet Bulletin. 35 (4): 155–160. Bibcode:2008MPBu...35..155M. ISSN   1052-8091.
    12. ↑ Clark, Maurice (July 2019). "Asteroid Photometry from the Preston Gott Observatory" (PDF). Minor Planet Bulletin. 46 (3): 346–349. Bibcode:2019MPBu...46..346C. ISSN   1052-8091.
    13. ↑ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN   978-3-540-00238-3.
    14. ↑ "LCDB Data for (1187) Afra". Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2020.
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