1623 Vivian

1623 Vivian
Discovery [1]
Discovered by Ernest Johnson
Discovery site Johannesburg Obs.
Discovery date 9 August 1948
Designations
MPC designation 1623 Vivian
Named after
 Vivian Hirst
(daughter of astronomer)
William P. Hirst[2]
1948 PL · 1951 EG2
1954 SA · 1955 YC
1960 WP · 1965 QB
1965 UW · 1973 GG
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 67.52 yr (24661 days)
Aphelion 3.6332 AU (543.52 Gm)
Perihelion 2.6535 AU (396.96 Gm)
3.1434 AU (470.25 Gm)
Eccentricity 0.15583
5.57 yr (2035.6 d)
325.99°
0° 10m 36.66s / day
Inclination 2.4903°
115.63°
316.86°
Earth MOID 1.66826 AU (249.568 Gm)
Jupiter MOID 1.65334 AU (247.336 Gm)
Jupiter Tisserand parameter 3.189
Physical characteristics
Dimensions 29.98±1.74 km[4]
27.85±0.35 km[5]
27.04 km (calculated)[3]
20.5209 h (0.85504 d)[1][6]
20.5235±0.0005 h[7]
0.078±0.010[4]
0.075±0.012[5]
0.08 (assumed)[3]
C [3]
11.3

    1623 Vivian, provisional designation 1948 PL, is a carbonaceous asteroid from the outer region of the asteroid belt, about 27 kilometers in diameter. It was discovered by South African astronomer Ernest Leonard Johnson at Union Observatory, Johannesburg on 9 August 1948.[8]

    The asteroid is a member of the Themis family, a large group of asteroids in the outer main-belt. It orbits the Sun at a distance of 2.7–3.6 AU once every 5 years and 7 months (2,036 days). Its orbit shows an eccentricity of 0.16 and is nearly coplanar to the plane of the ecliptic, inclined by 2 degrees, which is typical for Themistian asteroids. The C-type body has a relatively long rotation period of 20.52 hours[6][7] and an albedo of about 0.08.[4][5]

    It was named in honor of Vivian Hirst, daughter of British astronomer William P. Hirst, receiver of the Astronomical Society of Southern Africa's Gill Medal and after whom the minor planet 3172 Hirst is named. Hirst calculated the preliminary orbit for this and several other minor planets discovered by Ernest Johnson.[2]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 1623 Vivian (1948 PL)" (2015-10-22 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1623) Vivian. Springer Berlin Heidelberg. p. 129. ISBN 978-3-540-29925-7. Retrieved 15 November 2015.
    3. 1 2 3 4 "LCDB Data for (1623) Vivian". Asteroid Lightcurve Database (LCDB). Retrieved 15 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 15 November 2015.
    5. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; 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 15 November 2015.
    6. 1 2 Molnar, Lawrence A.; Haegert, Melissa J.; Beaumont, Christopher N.; Block, Marjorie J.; Brom, Timothy H.; et al. (March 2008). "Lightcurve Analysis of a Magnitude Limited Asteroid Sample". The Minor Planet Bulletin. 35 (1): 9–12. Bibcode:2008MPBu...35....9M. ISSN 1052-8091. Retrieved 15 November 2015.
    7. 1 2 Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy & Astrophysics. 559: 19. arXiv:1309.4296Freely accessible. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 15 November 2015.
    8. ↑ "1623 Vivian (1948 PL)". Minor Planet Center. Retrieved 15 November 2015.

    External links


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