From Wikipedia, the free encyclopedia
1264 Letaba , provisional designation 1933 HG , is a carbonaceous
asteroid and possible
tumbler from the
background population of the outer
asteroid belt , approximately 70 kilometers in diameter. It was discovered on 21 April 1933, by South African astronomer
Cyril Jackson at the
Union Observatory in Johannesburg.
[18] The asteroid was named for the
Letaba River in eastern South Africa.
[2]
Orbit and classification
Letaba is a non-
family asteroid of the main belt's
background population .
[4] It orbits the Sun in the
outer asteroid belt at a distance of 2.4–3.3
AU once every 4 years and 10 months (1,773 days;
semi-major axis of 2.87 AU). Its orbit has an
eccentricity of 0.15 and an
inclination of 25
° with respect to the
ecliptic .
[1]
The asteroid was first identified as 1930 WC at
Simeiz Observatory in November 1930. The body's
observation arc begins at Johannesburg, the night before its official discovery observation.
[18]
Physical characteristics
In the
SMASS classification , Letaba is a carbonaceous
C-type asteroid .
[1]
[3]
Rotation period
Several rotational
lightcurves of Letaba have been obtained from photometric observations since 2002.
[12]
[13]
[15]
[16] The best-rated lightcurve was measured by the Spanish amateur astronomer group OBAS in July 2016. It gave a longer-than average
rotation period of 32.74 hours with a brightness variation of 0.28
magnitude (
U=3 ).
[14] It might be a
tumbler due to the lightcurve's inconsistent slope segments (T? ).
[3]
[16] Based on its current diameter estimate, Letaba would be the second-largest tumbler just behind the Hildian asteroid
1512 Oulu (see
List of tumblers ) .
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite
IRAS , the Japanese
Akari satellite and the
NEOWISE mission of NASA's
Wide-field Infrared Survey Explorer , Letaba measures between 66.040 and 74.74 kilometers in diameter and its surface has an
albedo between 0.0407 and 0.093.
[5]
[6]
[7]
[8]
[9]
[10]
[11]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0462 and a diameter of 74.35 kilometers based on an
absolute magnitude of 9.6.
[3]
Naming
This
minor planet was named after the
Letaba River , located in eastern South Africa. The official naming citation was mentioned in
The Names of the Minor Planets by
Paul Herget in 1955 (
H 116 ).
[2]
References
^
a
b
c
d
e
f
"JPL Small-Body Database Browser: 1264 Letaba (1933 HG)" (2017-11-02 last obs.).
Jet Propulsion Laboratory . Archived from
the original on 18 September 2020. Retrieved 22 November 2017 .
^
a
b
c Schmadel, Lutz D. (2007). "(1264) Letaba". Dictionary of Minor Planet Names – (1264) Letaba .
Springer Berlin Heidelberg . p. 105.
doi :
10.1007/978-3-540-29925-7_1265 .
ISBN
978-3-540-00238-3 .
^
a
b
c
d
e
f
g
h
"LCDB Data for (1264) Letaba" . Asteroid Lightcurve Database (LCDB). Retrieved 22 November 2017 .
^
a
b
"Asteroid 1264 Letaba – Proper Elements" . AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019 .
^
a
b
c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal . 791 (2): 11.
arXiv :
1406.6645 .
Bibcode :
2014ApJ...791..121M .
doi :
10.1088/0004-637X/791/2/121 .
S2CID
119293330 .
^
a
b
c
d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016).
"NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos" . The Astronomical Journal . 152 (3): 12.
arXiv :
1606.08923 .
Bibcode :
2016AJ....152...63N .
doi :
10.3847/0004-6256/152/3/63 .
^
a
b
c
d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015).
"NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos" . The Astrophysical Journal . 814 (2): 13.
arXiv :
1509.02522 .
Bibcode :
2015ApJ...814..117N .
doi :
10.1088/0004-637X/814/2/117 .
S2CID
9341381 . Retrieved 22 November 2017 .
^
a
b
c
d Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017).
"NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos" . The Astronomical Journal . 154 (4): 10.
arXiv :
1708.09504 .
Bibcode :
2017AJ....154..168M .
doi :
10.3847/1538-3881/aa89ec .
^
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 . (
online ,
AcuA catalog p. 153 )
^
a
b
c
d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal . 741 (2): 25.
arXiv :
1109.6407 .
Bibcode :
2011ApJ...741...90M .
doi :
10.1088/0004-637X/741/2/90 .
S2CID
35447010 .
^
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 .
^
a
b
c Behrend, Raoul.
"Asteroids and comets rotation curves – (1264) Letaba" . Geneva Observatory. Retrieved 22 November 2017 .
^
a
b Stephens, Robert D. (December 2002).
"Photometry of 430 Hybris, 798 Ruth, 1264 Letaba, and 3786 Yamada" . The Minor Planet Bulletin . 30 (1): 1–2.
Bibcode :
2003MPBu...30....1S .
ISSN
1052-8091 . Retrieved 22 November 2017 .
^
a
b Brines, Pedro; Lozano, Juan; Rodrigo, Onofre; Fornas, A.; Herrero, David; Mas, Vicente; et al. (April 2017).
"Sixteen Asteroids Lightcurves at Asteroids Observers (OBAS) - MPPD: 2016 June-November" . The Minor Planet Bulletin . 44 (2): 145–149.
Bibcode :
2017MPBu...44..145B .
ISSN
1052-8091 . Retrieved 22 November 2017 .
^
a
b Ferrro, Andrea (April 2017).
"Rotational Period of Three Main-belt Asteroids" . The Minor Planet Bulletin . 44 (2): 142.
Bibcode :
2017MPBu...44..142F .
ISSN
1052-8091 . Retrieved 22 November 2017 .
^
a
b
c Oey, Julian; Williams, Hasen; Groom, Roger (July 2017).
"Lightcurve Analysis of Asteroids from BMO and DRO in 2015" . The Minor Planet Bulletin . 44 (3): 200–204.
Bibcode :
2017MPBu...44..200O .
ISSN
1052-8091 . Retrieved 22 November 2017 .
^ 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 .
S2CID
53493339 . Retrieved 22 November 2017 .
^
a
b
"1264 Letaba (1933 HG)" . Minor Planet Center . Retrieved 22 November 2017 .
External links