1117 Reginita

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1117 Reginita
Discovery [1]
Discovered by J. Comas Solà
Discovery site Fabra Obs.
Discovery date 24 May 1927
MPC designation (1117) Reginita
Named after
Reginita (discoverer's niece)[2]
1927 KA · A904 TA
main-belt · (inner)[3]
background [4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 112.47 yr (41,080 days)
Aphelion 2.6934 AU
Perihelion 1.8017 AU
2.2475 AU
Eccentricity 0.1984
3.37 yr (1,231 days)
0° 17m 33s / day
Inclination 4.3446°
Physical characteristics
Dimensions 9.82±2.35 km[5]
10.193±0.250 km[6][7]
10.29 km (taken)[3]
10.292 km[8]
11.22±0.35 km[9]
2.928±0.0134 h[10]
2.94±0.010 h[11]
2.9458±0.0002 h[12]
2.946±0.001 h[13]
2.9463±0.0006 h[14]
2.9464±0.0005 h[15]
11.436±0.001 (R)[10] · 11.470±0.070 (R)[11] · 11.69[3][7] · 11.69±0.1[8][14] · 11.70[1][9] · 11.96[5]

1117 Reginita, provisional designation 1927 KA, is a stony background asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 24 May 1927, by Catalan astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona, Spain, who named it after his niece.[2][16]

Orbit and classification[edit]

Reginita is a non-family asteroid from the main belt's background population.[4] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,231 days; semi-major axis of 2.25 AU). Its orbit has an eccentricity of 0.20 and an inclination of 4° with respect to the ecliptic.[1]

The asteroid was first observed as A904 TA at Heidelberg Observatory in October 1904. The body's observation arc also begins at Heidelberg in April 1930, almost three years after its official discovery observation at Barcelona.[16]

Physical characteristics[edit]

In the Tholen classification, Reginita is a common, stony S-type asteroid.[3]

Rotation period[edit]

Several rotational lightcurves of Reginita have been obtained from photometric observations since 1988.[10][11][12][13][14][15] The consolidated lightcurve analysis gave a rotation period of 2.946 hours with a brightness amplitude between 0.10 and 0.33 magnitude (U=3).[3]

Diameter and albedo[edit]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Reginita measures between 9.82 and 11.22 kilometers in diameter and its surface has an albedo between 0.293 and 0.36.[5][6][7][8][9]

The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data, that is, an albedo of 0.3516 and a diameter of 10.29 kilometers based on an absolute magnitude of 11.69.[3][8]


This minor planet was named after the niece of the discoverer. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 105).[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 1117 Reginita (1927 KA)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 10 January 2018. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1117) Reginita. Springer Berlin Heidelberg. p. 95. ISBN 978-3-540-00238-3. Retrieved 10 January 2018. 
  3. ^ a b c d e f g "LCDB Data for (1117) Reginita". Asteroid Lightcurve Database (LCDB). Retrieved 10 January 2018. 
  4. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Retrieved 10 January 2018. 
  5. ^ 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:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 10 January 2018. 
  6. ^ a b Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 10 January 2018. 
  7. ^ 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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 10 January 2018. 
  8. ^ a b c d e 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 10 January 2018. 
  9. ^ 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:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 10 January 2018. 
  10. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 10 January 2018. 
  11. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. arXiv:1506.08493Freely accessible. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27. Retrieved 10 January 2018. 
  12. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1117) Reginita". Geneva Observatory. Retrieved 10 January 2018. 
  13. ^ a b Tan, Hanjie; Li, Bin; Gao, Xing (October 2017). "The Rotation Period of 1117 Reginita". The Minor Planet Bulletin. 44 (4): 307. Bibcode:2017MPBu...44..307T. ISSN 1052-8091. Retrieved 10 January 2018. 
  14. ^ a b c 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. Bibcode:1995LPI....26.1511W. Retrieved 10 January 2018. 
  15. ^ a b Kryszczynska, A.; Colas, F.; Polinska, M.; Hirsch, R.; Ivanova, V.; Apostolovska, G.; et al. (October 2012). "Do Slivan states exist in the Flora family?. I. Photometric survey of the Flora region". Astronomy and Astrophysics. 546: 51. Bibcode:2012A&A...546A..72K. doi:10.1051/0004-6361/201219199. Retrieved 10 January 2018. 
  16. ^ a b "1117 Reginita (1927 KA)". Minor Planet Center. Retrieved 10 January 2018. 

External links[edit]