2253 Espinette

2253 Espinette, provisional designation 1932 PB, is a stony asteroid and sizable Mars-crosser from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered by George Van Biesbroeck in 1932, the asteroid was named after the discoverer's residence "Espinette".

2253 Espinette
Discovery [1]
Discovered byG. van Biesbroeck
Discovery siteYerkes Obs.
Discovery date30 July 1932
Designations
(2253) Espinette
Named after
Espinette
(discoverer's residence)[2]
1932 PB · 1939 RJ
1953 VB1 · 1970 PM
1977 TG
Mars-crosser [1][3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc84.74 yr (30,953 days)
Aphelion2.9195 AU
Perihelion1.6477 AU
2.2836 AU
Eccentricity0.2785
3.45 yr (1,260 days)
228.40°
0° 17m 8.16s / day
Inclination3.8804°
143.96°
175.75°
Physical characteristics
Dimensions7.03 km (derived)[4]
7.3±0.2 h[5]
7.440±0.002 h[6]
7.442±0.001[7]
7.442±0.002 h[lower-alpha 1]
0.20 (assumed)[4]
SMASS = Sl [1] · S [4]
12.8[1] · 13.13±0.12[4][5][8] · 16.06±0.31[9]

    Discovery

    Espinette was discovered on 30 July 1932, by Belgian–American astronomer George Van Biesbroeck at the U.S. Yerkes Observatory, Wisconsin.[3] The body was independently discovered on the following night by English-born South-African astronomer Cyril Jackson at Johannesburg, and by Soviet–Russian astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula, on August 4.[2] No precoveries were taken. The asteroid's observation arc begins a few days after its official discovering observation.[3]

    Orbit and classification

    The asteroid orbits the Sun in the inner main-belt at a distance of 1.6–2.9 AU once every 3 years and 5 months (1,260 days). Its orbit has an eccentricity of 0.28 and an inclination of 4° with respect to the ecliptic.[1]

    Physical characteristics

    In the SMASS taxonomic scheme, Espinette is classified as a Sl-subtype, which transitions from the common S-type asteroids to the much redder L-type asteroids.[1]

    Rotation period

    Several rotational lightcurves of Espinette have been obtained. In April 2011, photometric observations by American astronomer Brian A. Skiff rendered a well-defined rotation period of 7.442±0.002 hours with a brightness variation of 0.25 magnitude (U=3).[lower-alpha 1]

    In August 2015, another observation by Robert Stephens at the Center for Solar System Studies (U81), California, gave an identical period of 7.442±0.001 with an amplitude of 0.44 magnitude (U=3).[7] Previous observations by Polish astronomer Wiesław Z. Wiśniewski in 1987, and by Italian Federico Manzini in 2005, rendered similar results (U=2/2).[5][6]

    Diameter and albedo

    The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 7.0 kilometers.[4]

    Naming

    This minor planet was named "Espinette" after the discoverer's U.S. home in Williams Bay, Wisconsin, located near the discovering Yerkes Observatory. At their home, the Van Biesbroecks accommodated visitors of the observatory from all over the world. The name "Espinette" was proposed by the discoverer's children, and it refers to a coffeehouse in Belgium.[2] The official naming citation was published by the Minor Planet Center on 1 June 1981 (M.P.C. 6059).[10]

    Notes
    1. Skiff (2011) web: rotation period 7.442±0.002 hours with a brightness amplitude of 0.25 mag and an LCDB-quality code of 3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2253) Espinette

    References
    1. "JPL Small-Body Database Browser: 2253 Espinette (1932 PB)" (2017-04-28 last obs.). Jet Propulsion Laboratory. Retrieved 12 June 2017.
    2. Schmadel, Lutz D. (2007). "(2253) Espinette". Dictionary of Minor Planet Names – (2253) Espinette. Springer Berlin Heidelberg. p. 183. doi:10.1007/978-3-540-29925-7_2254. ISBN 978-3-540-00238-3.
    3. "2253 Espinette (1932 PB)". Minor Planet Center. Retrieved 19 May 2016.
    4. "LCDB Data for (2253) Espinette". Asteroid Lightcurve Database (LCDB). Retrieved 19 May 2016.
    5. Wisniewski, W. Z.; Michalowski, T. M.; Harris, A. W.; McMillan, R. S. (March 1995). "Photoelectric Observations of 125 Asteroids". Abstracts of the Lunar and Planetary Science Conference. 26: 1511. Bibcode:1995LPI....26.1511W. Retrieved 19 May 2016.
    6. Behrend, Raoul. "Asteroids and comets rotation curves – (2253) Espinette". Geneva Observatory. Retrieved 19 May 2016.
    7. Stephens, Robert D. (January 2016). "Asteroids Observed from CS3: 2015 July - September". The Minor Planet Bulletin. 43 (1): 52–56. Bibcode:2016MPBu...43...52S. ISSN 1052-8091. Retrieved 19 May 2016.
    8. Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 19 May 2016.
    9. 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 19 May 2016.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 May 2016.

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