2865 Laurel

2865 Laurel, provisional designation 1935 OK, is a stony Marian asteroid from the middle region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered by English-born South African astronomer Cyril Jackson at Johannesburg Observatory on 31 July 1935.[9] The asteroid was named after movie comedian Stan Laurel.[2]

2865 Laurel
2865 Laurel orbit, and his position on 06 Jun 2011 (NASA Orbit Viewer applet)
Discovery [1]
Discovered byC. Jackson
Discovery siteJohannesburg Obs.
Discovery date31 July 1935
Designations
(2865) Laurel
Named after
Stan Laurel (film comedian)[2]
1935 OK · 1939 PA
1947 NF · 1951 ML
1972 QH
main-belt · (middle) [3]
Maria
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc81.62 yr (29,810 days)
Aphelion2.7406 AU
Perihelion2.3812 AU
2.5609 AU
Eccentricity0.0702
4.10 yr (1,497 days)
71.330°
0° 14m 25.8s / day
Inclination14.294°
321.79°
293.35°
Physical characteristics
Dimensions14.73±1.2 km (IRAS:3)[4]
14.79 km (derived)[3]
18.83±0.73 km[5]
24.99±0.37 km[6]
21.5±0.3 h[7]
0.094±0.014[6]
0.142±0.013[5]
0.2242±0.043 (IRAS:3)[4]
0.2438 (derived)[3]
S [3][8]
11.20[6] · 11.24±0.30[8] · 11.3[1][3] · 11.40[4][5]

    Orbit and classification

    Laurel orbits the Sun in the central main-belt at a distance of 2.4–2.7 AU once every 4 years and 1 month (1,497 days). Its orbit has an eccentricity of 0.07 and an inclination of 14° with respect to the ecliptic.[1] No precoveries were taken and the asteroid's observation arc begins with its discovery observation in 1935.[9]

    Physical characteristics

    Laurel has been characterized as a common S-type asteroid by PanSTARRS' photometric survey.[8]

    Rotation period

    A rotational lightcurve for this asteroid was obtained from photometric observations by French amateur astronomer Pierre Antonini in September 2005. It gave a longer than average rotation period of 21.5±0.3 hours with a brightness variation of 0.15 in magnitude (U=2).[7]

    Diameter and albedo

    According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 14.7 and 25.0 kilometers in diameter and its surface has an albedo between 0.09 and 0.22.[4][5][6] The Collaborative Asteroid Lightcurve Link agrees with IRAS and derives an albedo of 0.24 and a diameter 14.8 kilometers.[3]

    Naming

    This minor planet was named after English-born slapstick film comedian Stan Laurel (1890–1965). Together with Oliver Hardy (1892–1957), who was honored with the main-belt asteroid 2866 Hardy, they formed the first great comedy duo in Classical Hollywood cinema.[2] The official naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22496),[10] based on a suggestion by Gareth V. Williams and others.[2]

    References
    1. "JPL Small-Body Database Browser: 2865 Laurel (1935 OK)" (2017-03-12 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
    2. Schmadel, Lutz D. (2007). "(2865) Laurel". Dictionary of Minor Planet Names – (2865) Laurel. Springer Berlin Heidelberg. p. 235. doi:10.1007/978-3-540-29925-7_2866. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (2865) Laurel". Asteroid Lightcurve Database (LCDB). Retrieved 9 July 2016.
    4. Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 22 October 2019.
    5. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; 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 17 October 2019. (online, AcuA catalog p. 153)
    6. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; 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 9 July 2016.
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (2865) Laurel". Geneva Observatory. Retrieved 9 July 2016.
    8. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 9 July 2016.
    9. "2865 Laurel (1935 OK)". Minor Planet Center. Retrieved 9 July 2016.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 9 July 2016.

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