From Wikipedia, the free encyclopedia
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.
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]
References
^
a
b
c
d
e
"1187 Afra (1929 XC)" . Minor Planet Center . Retrieved 14 March 2020 .
^
a
b 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 .
^
a
b
c
d
e
"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 .
^
a
b
"Asteroid 1187 Afra – Proper Elements" . AstDyS-2, Asteroids – Dynamic Site. Retrieved 14 March 2020 .
^
a
b
"Asteroid 1187 Afra" . Small Bodies Data Ferret . Retrieved 14 March 2020 .
^
a
b 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 .
^
a
b 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 )
^
a
b 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 .
^ 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 .
^ Behrend, Raoul.
"Asteroids and comets rotation curves – (1187) Afra" . Geneva Observatory. Retrieved 14 March 2020 .
^
a
b 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 .
^ 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 .
^
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 .
^
"LCDB Data for (1187) Afra" . Asteroid Lightcurve Database (LCDB). Retrieved 14 March 2020 .
External links