|Discovered by||G. van Biesbroeck|
|Discovery site||Yerkes Obs.|
|Discovery date||30 July 1932|
|MPC designation||2253 Espinette|
1932 PB · 1939 RJ|
1953 VB1 · 1970 PM
|Epoch 31 July 2016 (JD 2457600.5)|
|Uncertainty parameter 0|
|Observation arc||83.59 yr (30,530 days)|
|3.45 yr (1,260 days)|
|0° 17m 8.52s / day|
|Earth MOID||0.6331 AU|
|Dimensions||7.03 km (derived)|
±0.002 h 7.442
±0.002 h 7.440
|SMASS = Sl · S|
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. It was discovered on 30 July 1932, by Belgian–American astronomer George Van Biesbroeck at the U.S. Yerkes Observatory, Wisconsin. 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.
The S-type asteroid is classified as a Sl-subtype in the SMASS taxonomic scheme, a transitional type to the much redder L-type asteroids. It orbits the Sun 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. No precoveries were taken prior to its discovery. As an anomaly, the asteroid's observation arc excludes the discovering observation and begins a few days later.
Several rotational light-curves of this body have been obtained. In April 2011, photometric observations by American astronomer Brian A. Skiff rendered a well-defined rotation period of ±0.002 hours with a brightness amplitude of 0.25 in 7.442magnitude (U=3). In August 2015, another observation by Robert Stevens at the Center for Solar System Studies (CS3), California, gave an identical period of ±0.001 with a brightness variation of 0.44 in magnitude ( 7.442U=3). Previous observations by Polish astronomer Wiesław Z. Wiśniewski in 1987, and by Italian Federico Manzini in 2005, rendered similar results (U=2/2). The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 7.0 kilometers.
The 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. Naming citation was published on 1 June 1981 (M.P.C. 6059).
- Skiff (2011) web: rotation period ±0.002 hours with a brightness amplitude of 7.442 mag and an LCDB-quality code of 3. Summary figures at 0.25Collaborative Asteroid Lightcurve Link (CALL) for (2253) Espinette
- "JPL Small-Body Database Browser: 2253 Espinette (1932 PB)" (2016-03-05 last obs.). Jet Propulsion Laboratory. Retrieved 19 May 2016.
- Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2253) Espinette. Springer Berlin Heidelberg. p. 183. ISBN 978-3-540-00238-3. Retrieved 19 May 2016.
- "LCDB Data for (2253) Espinette". Asteroid Lightcurve Database (LCDB). Retrieved 19 May 2016.
- 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. Bibcode:1995LPI....26.1511W. Retrieved 19 May 2016.
- 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.
- Behrend, Raoul. "Asteroids and comets rotation curves – (2253) Espinette". Geneva Observatory. Retrieved 19 May 2016.
- 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.
- 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.
- "2253 Espinette (1932 PB)". Minor Planet Center. Retrieved 19 May 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 May 2016.
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2253 Espinette at the JPL Small-Body Database