1644 Rafita

1644 Rafita
Discovery [1]
Discovered by R. Carrasco
Discovery site Madrid Observatory
Discovery date 16 December 1935
Designations
MPC designation 1644 Rafita
Named after
 Rafael Carrasco
(discoverer's family)[2]
1935 YA · 1939 XA
1941 JB · 1949 JC
1951 VF · 1955 TS
1957 GD · 1959 UD
A906 RB · A916 BA
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 109.16 yr (39869 days)
Aphelion 2.9441 AU (440.43 Gm)
Perihelion 2.1536 AU (322.17 Gm)
2.5489 AU (381.31 Gm)
Eccentricity 0.15506
4.07 yr (1486.3 d)
228.51°
0° 14m 31.956s / day
Inclination 7.0188°
270.91°
196.99°
Earth MOID 1.17131 AU (175.225 Gm)
Jupiter MOID 2.2077 AU (330.27 Gm)
Jupiter Tisserand parameter 3.414
Physical characteristics
Dimensions 17.69±1.08 km[4]
15.405±0.072 km[5]
15.482 km[6]
15.48 km (taken)[3]
6.80 h[7]
5.100±0.002 h[8]
6.800 h (0.2833 d)[1]
0.106±0.014[4]
0.1403±0.0148[5]
0.1329[6]
B–V = 0.867
U–B = 0.404
Tholen = S
S [3]
11.82

    1644 Rafita, provisional designation 1935 YA, is a stony asteroid from the inner regions of the asteroid belt, about 16 kilometers in diameter. It was discovered by Spanish astronomer Rafael Carrasco at the Royal Observatorio Astronómico de Madrid, Spain on 16 December 1935.[9]

    The asteroid orbits the Sun at a distance of 2.2–2.9 AU once every 4 years and 1 month (1,486 days). Its orbit shows an eccentricity of 0.16 and is tilted by 7 degrees to the plane of the ecliptic. It has a rotation period of 6.8 hours.[7] Based on results from the Akari, WISE and NEOWISE mission, the S-type asteroid has a relatively low albedo of 0.10–0.15.[4][5][6]

    The minor planet was named by the discoverer in honor of his late son, Rafael Carrasco.[2]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 1644 Rafita (1935 YA)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1644) Rafita. Springer Berlin Heidelberg. p. 130. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 "LCDB Data for (1644) Rafita". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; 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. Retrieved November 2015.
    5. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; 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. Retrieved November 2015.
    6. 1 2 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. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved November 2015.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1644) Rafita". Geneva Observatory. Retrieved November 2015.
    8. ↑ Harris, A. W.; Young, J. W. (October 1989). "Asteroid lightcurve observations from 1979-1981". Icarus: 314–364. Bibcode:1989Icar...81..314H. doi:10.1016/0019-1035(89)90056-0. ISSN 0019-1035. Retrieved November 2015.
    9. ↑ "1644 Rafita (1935 YA)". Minor Planet Center. Retrieved November 2015.

    External links


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