astro.wikisort.org - Asteroid
9641 Demazière, provisional designation 1994 PB30, is a stony asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered by Belgian astronomer Eric Elst at ESO's La Silla Observatory site in northern Chile on 12 August 1994.[6] The asteroid was named for Belgian scientist Martine De Mazière.[2]
| Discovery [1] | |
|---|---|
| Discovered by | E. W. Elst |
| Discovery site | La Silla Obs. |
| Discovery date | 12 August 1994 |
| Designations | |
MPC designation | (9641) Demazière |
Named after | Martine De Mazière (Belgian scientist)[2] |
Alternative designations | 1994 PB30 · 1997 GY36 |
Minor planet category | main-belt · (inner) [3] |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 25.44 yr (9,292 days) |
| Aphelion | 2.7776 AU |
| Perihelion | 2.1279 AU |
Semi-major axis | 2.4527 AU |
| Eccentricity | 0.1324 |
Orbital period (sidereal) | 3.84 yr (1,403 days) |
Mean anomaly | 40.595° |
Mean motion | 0° 15m 23.76s / day |
| Inclination | 4.7578° |
Longitude of ascending node | 222.02° |
Argument of perihelion | 60.654° |
| Physical characteristics | |
| Dimensions | 2.71 km (calculated)[3] |
Synodic rotation period | 9.9121±0.0527 h[4] |
Geometric albedo | 0.20 (assumed)[3] |
Spectral type | S [3] · V [5] |
Absolute magnitude (H) | 14.5[1] · 14.751±0.009 (R)[4] · 14.73±0.22[5] · 15.2[3] |
Orbit and classification
Demazière orbits the Sun in the inner main-belt at a distance of 2.1–2.8 AU once every 3 years and 10 months (1,403 days). Its orbit has an eccentricity of 0.13 and an inclination of 5° with respect to the ecliptic.[1] A first precovery was obtained by the Steward Observatory at Kitt Peak in 1991, extending the body's observation arc by 3 years prior to its official discovery observation at La Silla.[6]
Physical characteristics
Demazière has been characterized as a V-type asteroid by Pan-STARRS photometric survey.[5]
Lightcurves
In November 2010, a rotational lightcurve of Demazière was obtained from photometric observations taken at the Palomar Transient Factory in California. It gave a rotation period of 9.9121 hours with a brightness amplitude of 0.9 magnitude (U=2).[4]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.7 kilometers with an absolute magnitude of 15.2.[3]
Naming
This minor planet was named in honor of Belgian scientist Martine De Mazière (born 1960), director-general at the Belgian Institute for Space Aeronomy as of 2016.[7] Working with the optical scanning of Earth's atmosphere, her research focuses on the effect of aerosols in the atmosphere's composition. Mazière has also assessed the post-Pinatubo NO2 reduction and recovery, using spectroscopic observations in the UV and visible made at the Swiss Sphinx Observatory (Jungfraujoch) over a period of 10 years.[2]
The approved naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34630).[8]
References
- "JPL Small-Body Database Browser: 9641 Demaziere (1994 PB30)" (2017-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
- Schmadel, Lutz D. (2007). "(9641) Demazière". Dictionary of Minor Planet Names – (9641) Demazière. Springer Berlin Heidelberg. p. 701. doi:10.1007/978-3-540-29925-7_7612. ISBN 978-3-540-00238-3.
- "LCDB Data for (9641) Demaziere". Asteroid Lightcurve Database (LCDB). Retrieved 13 April 2016.
- Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 17 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 17 May 2016.
- "9641 Demaziere (1994 PB30)". Minor Planet Center. Retrieved 13 April 2016.
- "Belgian Institute for Space Aeronomy". Belspo. Retrieved 13 April 2016.
- "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.
External links
- Martine De Mazière, Belgian Institute for Space Space Aeronomy, Brussels, Belgium (at ResearchGate)
- BIRA-IASB, Royal Belgian Institute for Space Aeronomy
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- 9641 Demazière at AstDyS-2, Asteroids—Dynamic Site
- 9641 Demazière at the JPL Small-Body Database
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