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 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 67.20 yr (24,545 days)
Aphelion 3.6342 AU
Perihelion 2.6535 AU
3.1439 AU
Eccentricity 0.1559
5.57 yr (2,036 days)
290.66°
Inclination 2.4903°
115.62°
316.83°
Physical characteristics
Dimensions 29.98±1.74 km[4]
27.85±0.35 km[5]
27.04 km (calculated)[3]
20.5209 h[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 "JPL Small-Body Database Browser: 1623 Vivian (1948 PL)" (2015-10-22 last obs.). Jet Propulsion Laboratory. Retrieved November 2015.
    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 November 2015.
    3. 1 2 3 4 "LCDB Data for (1623) Vivian". 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 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 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". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 35 (1): 9–12. Bibcode:2008MPBu...35....9M. ISSN 1052-8091. Retrieved 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:1309.4296. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved November 2015.
    8. ↑ "1623 Vivian (1948 PL)". Minor Planet Center. Retrieved November 2015.

    External links


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