1919 Clemence

1919 Clemence
Discovery [1]
Discovered by J. Gibson
C. U. Cesco
Discovery site El Leoncito
Discovery date 16 September 1971
Designations
MPC designation 1919 Clemence
Named after
 Gerald Clemence
(astronomer)[2]
1971 SA · 1970 EA1
1971 QZ
main-belt (inner)[1]
Hungaria [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 44.50 yr (16,255 days)
Aphelion 2.1201 AU
Perihelion 1.7523 AU
1.9362 AU
Eccentricity 0.0949
2.69 yr (984 days)
66.688°
0° 21m 56.952s / day
Inclination 19.337°
356.99°
100.09°
Physical characteristics
Dimensions 3.238±0.015 km[4]
4.95 km (calculated)[3]
67.4±0.1 h[5]
68.5±0.1 h[6]
0.7103±0.0672[4]
0.3 (assumed)[3]
B–V = 0.750[1]
U–B = 0.254[1]
Tholen = X[1]
X [3] · E [4]
13.45[1][3][4]

    1919 Clemence, provisional designation 1971 SA, is a bright Hungaria asteroid and suspected tumbler from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 16 September 1971, by American astronomer James Gibson together with Argentine astronomer Carlos Cesco at the Yale-Columbia Southern Station at Leoncito Astronomical Complex in Argentina.[7]

    The bright E-type asteroid, classified as a X-type body on the Tholen taxonomic scheme, is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.8–2.1 AU once every 2 years and 8 months (984 days). Its orbit has a typically low eccentricity of 0.09 and an inclination of 19° with respect to the ecliptic.[1]

    Photometric measurements of this body by American astronomer Brian Warner made in 2005 at the U.S. Palmer Divide Observatory (PDO), Colorado, showed a revised rotational light-curve with a period of 67.4±0.1 hours and a brightness variation of 0.15 in magnitude (U=2).[5] Czech astronomer Petr Pravec from the Ondřejov Observatory believes this may be a tumbling asteroid, yet observations are not sufficient to determine a non-principal axis rotation.[6][8]

    According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.2 kilometers in diameter and its surface has an outstandingly hight albedo of 0.71,[4] while the Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.30 and calculates a somewhat larger diameter of 4.95 kilometers.[3]

    It is named for American astronomer Gerald Maurice Clemence (1908–1974), first scientific director of the United States Naval Observatory and professor of astronomy at the Yale Observatory, known for his work on the theory of the motion of Mars and Mercury, on the system of astronomical constants, and other research in celestial mechanics. He served as president of the American Astronomical Society and of IAU.[2]

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1919 Clemence (1971 SA)" (2016-03-18 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1919) Clemence. Springer Berlin Heidelberg. p. 154. ISBN 978-3-540-00238-3. Retrieved April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (1919) Clemence". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    4. 1 2 3 4 5 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. Retrieved April 2016.
    5. 1 2 Warner, Brian D.; Stephens, Robert, D.; Harris, Alan W.; Pravec, Petr (October 2009). "A Re-examination of the Lightcurves for Seven Hungaria Asteroids". The Minor Planet Bulletin 36 (4): 176–179. Bibcode:2009MPBu...36..176W. ISSN 1052-8091. Retrieved April 2016.
    6. 1 2 Warner, Brian D. (September 2005). "Asteroid lightcurve analysis at the Palmer Divide Observatory - winter 2004-2005". The Minor Planet Bulletin 32 (3): 54–58. Bibcode:2005MPBu...32...54W. ISSN 1052-8091. Retrieved April 2016.
    7. ↑ "1919 Clemence (1971 SA)". Minor Planet Center. Retrieved April 2016.
    8. ↑ Pravec, P.; Scheirich, P.; Durech, J.; Pollock, J.; Kusnirák, P.; Hornoch, K.; et al. (May 2014). "The tumbling spin state of (99942) Apophis". Icarus 233: 48–60. Bibcode:2014Icar..233...48P. doi:10.1016/j.icarus.2014.01.026. Retrieved April 2016.

    External links


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