1946 Walraven

1946 Walraven
Discovery [1]
Discovered by H. van Gent
Discovery site Johannesburg Obs.
(Leiden Southern Station)
Discovery date 8 August 1931
Designations
MPC designation 1946 Walraven
Named after
 Theodore Walraven
(astronomer)[2]
1931 PH · 1952 PB
1959 RE1 · 1966 TC
1972 JE1
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 84.59 yr (30895 days)
Aphelion 2.8332 AU (423.84 Gm)
Perihelion 1.7531 AU (262.26 Gm)
2.2931 AU (343.04 Gm)
Eccentricity 0.23550
3.47 yr (1268.4 d)
72.453°
0° 17m 1.788s / day
Inclination 8.1630°
17.275°
339.77°
Earth MOID 0.750364 AU (112.2529 Gm)
Jupiter MOID 2.60989 AU (390.434 Gm)
Jupiter Tisserand parameter 3.546
Physical characteristics
Dimensions 9.205±0.109 km[4]
11.83 km (calculated)[3]
10.223 h (0.4260 d)[1][5]
10.22±0.02 h[6]
0.3622±0.0670[4]
0.20 (assumed)[3]
S [3]
12.0

    1946 Walraven, provisional designation 1931 PH, is a stony asteroid from the inner regions of the asteroid belt. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 8 August 1931.[7]

    The S-type asteroid measures about 10 kilometers in diameter. It orbits the Sun at a distance of 1.8–2.8 AU once every 3.47 years (1,269 days). It has a rather long rotation period of 10.2 hours.[5][6] Its geometric albedo is 0.36 and 0.2, according to preliminary results from the NEOWISE mission and assumptions made by the Light Curve Database project, respectively.[3][4] For a main-belt asteroid, Walraven shows a relatively high eccentricity of 0.23. Its orbit is inclined by 8 degrees to the plane of the ecliptic.[1]

    The asteroid was named in honor of astronomer and pioneer in optical instrumentation and precision photometry, Theodore Walraven (1916–2008),[8] who was a professor at the Leiden University and for many years resident astronomer at the former Leiden Southern Station near Hartbeespoortdam, South Africa. He constructed special photometers for the telescopes at the station, including the 5-color photometer for which he developed the Walraven photometric system.[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1946 Walraven (1931 PH)" (2015-09-27 last obs.). Jet Propulsion Laboratory. Retrieved 18 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1946) Walraven. Springer Berlin Heidelberg. p. 156. ISBN 978-3-540-29925-7. Retrieved 7 November 2015.
    3. 1 2 3 4 5 "LCDB Data for (1946) Walraven". Asteroid Lightcurve Database (LCDB). Retrieved 7 November 2015.
    4. 1 2 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. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 7 November 2015.
    5. 1 2 van Gent, H. (May 1933). "Period, light-curve, and ephemeris of the new asteroid with variable brightness 1931 PH". Bulletin of the Astronomical Institutes of the Netherlands. 7. Bibcode:1933BAN.....7...65V. Retrieved 7 November 2015.
    6. 1 2 Folberth, James; Casimir, Serick; Dou, Yueheng; Evans, Davis; Foulkes, Thomas; Haenftling, Miranda; et al. (April 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2011 July-September". The Minor Planet Bulletin. 39 (2): 51–55. Bibcode:2012MPBu...39...51F. ISSN 1052-8091. Retrieved 7 November 2015.
    7. ↑ "1946 Walraven (1931 PH)". Minor Planet Center. Retrieved 7 November 2015.
    8. ↑ "Theodore Walraven (1916–2008) Dutch pioneer in optical instrumentation and precision photometry". Leiden Observatory. Retrieved 7 November 2015.

    External links


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