1117 Reginita

1117 Reginita (prov. designation: 1927 KA) is a stony background asteroid from the inner regions of the asteroid belt. 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][1] The bright S-type asteroid has a notably short rotation period of 2.9 hours and measures approximately 10 kilometers (6.2 miles) in diameter.

1117 Reginita
Shape model of Reginita from its lightcurve
Discovery [1]
Discovered byJ. Comas Solà
Discovery siteFabra Obs.
Discovery date24 May 1927
Designations
(1117) Reginita
Named after
Reginita (discoverer's niece)[2]
1927 KA · A904 TA
Orbital characteristics [3]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc112.47 yr (41,080 days)
Aphelion2.6934 AU
Perihelion1.8017 AU
2.2475 AU
Eccentricity0.1984
3.37 yr (1,231 days)
245.71°
0° 17m 33s / day
Inclination4.3446°
147.14°
151.05°
Physical characteristics
Dimensions9.82±2.35 km[6]
10.193±0.250 km[7][8]
10.29 km (taken)[9]
10.292 km[10]
11.22±0.35 km[11]
2.928±0.0134 h[12]
2.94±0.010 h[13]
2.9458±0.0002 h[14]
2.946±0.001 h[15]
2.9463±0.0006 h[16]
2.9464±0.0005 h[17]
0.293±0.041[11]
0.3516[10]
0.3585±0.0785[8]
0.36±0.13[6]
S (Tholen)[9]
11.7[1][3][11]

    Orbit and classification

    Reginita 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 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.[3] 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.[1]

    Naming

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

    Physical characteristics

    In the Tholen classification, Reginita is a common, stony S-type asteroid.[9]

    Rotation period

    Several rotational lightcurves of Reginita have been obtained from photometric observations since 1988.[12][13][14][15][16][17] 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).[9]

    Diameter and albedo

    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.[6][7][8][10][11] 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.[9][10]

    References
    1. "1117 Reginita (1927 KA)". Minor Planet Center. Retrieved 10 January 2018.
    2. Schmadel, Lutz D. (2007). "(1117) Reginita". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 95. doi:10.1007/978-3-540-29925-7_1118. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 1117 Reginita (1927 KA)" (2017-03-30 last obs.). Jet Propulsion Laboratory. Retrieved 10 January 2018.
    4. "Asteroid 1117 Reginita – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 13 March 2020.
    5. "Asteroid 1117 Reginita". Small Bodies Data Ferret. Retrieved 13 March 2020.
    6. 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.
    7. 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:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68.
    8. 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.
    9. "LCDB Data for (1117) Reginita". Asteroid Lightcurve Database (LCDB). Retrieved 10 January 2018.
    10. 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.
    11. 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.
    12. 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:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75.
    13. 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:1506.08493. Bibcode:2015ApJS..219...27C. doi:10.1088/0067-0049/219/2/27.
    14. Behrend, Raoul. "Asteroids and comets rotation curves – (1117) Reginita". Geneva Observatory. Retrieved 10 January 2018.
    15. 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.
    16. 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. 26: 1511. Bibcode:1995LPI....26.1511W.
    17. 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.
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