Astronomy:1644 Rafita

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1644 Rafita
Discovery[1]
Discovered byR. Carrasco
Discovery siteMadrid Obs.
Discovery date16 December 1935
Designations
(1644) Rafita
Named afterRafael Carrasco
(discoverer's son)[2]
1935 YA · 1939 XA
1941 JB · 1949 JC
1951 VF · 1955 TS
1957 GD · 1959 UD
A906 RB · A916 BA
Minor planet categorymain-belt · (middle)[3]
Rafita-interloper[4]:23
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc110.53 yr (40,371 days)
|{{{apsis}}}|helion}}2.9426 AU
|{{{apsis}}}|helion}}2.1539 AU
2.5483 AU
Eccentricity0.1548
Orbital period4.07 yr (1,486 days)
Mean anomaly13.784°
Mean motion0° 14m 32.28s / day
Inclination7.0193°
Longitude of ascending node270.90°
197.05°
Physical characteristics
Dimensions13.958±0.157 km[5]
15.405±0.072 km[6]
15.48 km (taken)[3]
15.482 km[7]
17.69±1.08 km[8]
Rotation period5.100±0.002 h[9]
6.800±0.004 h[10]
Geometric albedo0.106±0.014[8]
0.1329[7]
0.1403±0.0148[6]
0.164±0.028[5]
Tholen = S[1][3]
B–V = 0.867[1]
U–B = 0.404[1]
Absolute magnitude (H)11.82[1][6][8] · 11.82±0.21[11] · 11.86±0.02[3][7][9]


1644 Rafita, provisional designation 1935 YA, is a stony asteroid from the middle region of the asteroid belt, approximately 15 kilometers in diameter. It is the namesake of the Rafita family, a family of stony asteroids in the intermediate main-belt. However, Rafita is a suspected interloper in its own family.[4]:23 It was discovered on 16 December 1935, by Spanish astronomer Rafael Carrasco Garrorena at the Royal Observatorio Astronómico de Madrid in Spain, and named in memory of the discoverer's son.[2][12]

Orbit and classification

Rafita asteroid orbits the Sun in the central main-belt at a distance of 2.2–2.9 AU once every 4 years and 1 month (1,486 days). Its orbit has an eccentricity of 0.15 and an inclination of 7° with respect to the ecliptic.[1] Rafita was first observed as A906 RB at Heidelberg Observatory in 1906, extending the body's observation arc by 29 years prior to its official discovery observation.[12]

Lightcurves

Rafita's first rotational lightcurve was obtained by American astronomer Alan Harris of JPL in January 1981. It gave a rotation period of 5.100 hours with a brightness variation of 0.31 magnitude ({{{1}}}).[9] Photometric observations by French amateur astronomer Laurent Bernasconi in December 2004, gave a period of 6.800 hours and an amplitude of 0.13 magnitude ({{{1}}}).[10]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Rafita measures between 13.96 and 17.69 kilometers in diameter, and its surface has an albedo between 0.106 and 0.164.[5][6][8] The Collaborative Asteroid Lightcurve Link agrees with Petr Pravec's revised WISE-results, that is an albedo of 0.1329 and a diameter of 15.482 kilometers, based on an absolute magnitude of 11.86.[3][7]

Naming

This minor planet was named by the discoverer in honor of his late son, Rafael Carrasco.[2] The official naming citation was published by the Minor Planet Center on 30 January 1964 (M.P.C. 2277).[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 1644 Rafita (1935 YA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001644. Retrieved 30 June 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1644) Rafita". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 130. doi:10.1007/978-3-540-29925-7_1645. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "LCDB Data for (1644) Rafita". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1644%7CRafita. Retrieved 27 December 2016. 
  4. ↑ 4.0 4.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. Bibcode: 2015aste.book..297N. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 27 December 2016. 
  6. ↑ 6.0 6.1 6.2 6.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1016/j.icarus.2012.07.026. Bibcode: 2012Icar..221..365P. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P. Retrieved 27 December 2016. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  9. ↑ 9.0 9.1 9.2 Harris, A. W.; Young, J. W. (October 1989). "Asteroid lightcurve observations from 1979-1981". Icarus 81 (2): 314–364. doi:10.1016/0019-1035(89)90056-0. ISSN 0019-1035. Bibcode: 1989Icar...81..314H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1989Icar...81..314H. Retrieved 27 December 2016. 
  10. ↑ 10.0 10.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1644) Rafita". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001644. Retrieved 27 December 2016. 
  11. ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 27 December 2016. 
  12. ↑ 12.0 12.1 "1644 Rafita (1935 YA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1644. Retrieved 27 December 2016. 
  13. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. 

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