9641 Demazière

9641 Demazière
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
(scientist)[2]
1994 PB30 · 1997 GY36
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 24.22 yr (8,845 days)   
Aphelion 2.7797 AU
Perihelion 2.1278 AU
2.4537 AU
Eccentricity 0.1328
3.84 yr (1,404 days)
246.93°
0° 15m 23.04s / day
Inclination 4.7542°
222.05°
60.377°
Physical characteristics
Dimensions 2.71 km (calculated)[3]
9.9121±0.0527 h[4]
0.20 (assumed)[3]
S [3] · V [5]
14.5[1]
14.751±0.009 (R)[4]
14.73±0.22[5]

    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 stony S-type body is also classified as a V-type or vestoid asteroid.[5] It orbits the Sun at a distance of 2.1–2.8 AU once every 3 years and 10 months (1,404 days). Its orbit has an eccentricity of 0.13 and an inclination of 5° with respect to the plane of the ecliptic.[1]

    A rotational light-curve was obtained from photometric observations made at the U.S. Palomar Transient Factory, California, in November 2010. It showed a rotation period of 9.9121±0.0527 hours with a brightness amplitude of 0.9 in magnitude (U=2).[4] The Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.7 kilometers, based on an absolute magnitude of 15.2.[3]

    The minor planet was named in honor of Belgian female scientist Martine De Mazière (b. 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]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 9641 Demaziere (1994 PB30)" (2016-03-16 last obs.). Jet Propulsion Laboratory. Retrieved April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9641) Demazière. Springer Berlin Heidelberg. p. 701. ISBN 978-3-540-00238-3. Retrieved April 2016.
    3. 1 2 3 4 5 "LCDB Data for (9641) Demaziere". Asteroid Lightcurve Database (LCDB). Retrieved April 2016.
    4. 1 2 3 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 April 2016.
    5. 1 2 3 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 April 2016.
    6. ↑ "9641 Demaziere (1994 PB30)". Minor Planet Center. Retrieved April 2016.
    7. ↑ "Belgian Institute for Space Aeronomy". Belspo. Retrieved April 2016.

    External links


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