4492 Debussy

Shape model of Debussy from its lightcurve

Discovery [1]
Discovered by| E. W. Elst
Discovery site| Haute-Provence Obs.
Discovery date| 17 September 1988
Designations

MPC designation

| (4492) Debussy
Pronunciation| /dɛbjʊˈsiː/ etc.[4]
Named after| Claude Debussy [2]
(French composer)

Alternative designations

| 1988 SH * 1979 SZ10
1979 VF1 * 1981 EC
Minor planet category| main-belt * (middle)
background [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 65.65 yr (23,977 days)
|{{{apsis}}}|helion}}| 3.2631 AU
|{{{apsis}}}|helion}}| 2.2692 AU

Semi-major axis

| 2.7662 AU
Eccentricity| 0.1796
Orbital period| 4.60 yr (1,680 days)
Mean anomaly| 76.633°
Mean motion| 0° 12m 51.12s / day
Inclination| 8.0241°
Longitude of ascending node| 350.05°

|{{{apsis}}}|helion}}

| 52.507°
Known satellites| 1[5][6][7]
Physical characteristics
Mean diameter| 13.23±3.97 km[8]
14.64 km (calculated)[9]
14.75±0.91 km[10]
16.5±1.9 km[11]
17.14±2.94 km[12]
17.359±0.697 km[13][14]
Rotation period| 20 h[15]
26.58±0.05 h[15]
26.59 h[5]
26.6 h[11]
26.606±0.001 h[6]
Geometric albedo| 0.039±0.018[11]
0.0406±0.0162[13][14]
0.041±0.016
0.046±0.017[12]
0.057 (assumed)[9]
0.058±0.008[10]
0.07±0.08[8]

Spectral type

| C [9]
Absolute magnitude (H)| 12.80[12] * 12.9[1][9][10][13] * 13.05[8] * 13.05±0.07[11] * 13.37±0.25[16]

4492 Debussy (prov. designation: 1988 SH) is a dark and elongated background asteroid and binary system from the intermediate asteroid belt, approximately 15 kilometers (9.3 miles) in diameter. It was discovered on 17 September 1988, by Belgian astronomer Eric Elst at Haute-Provence Observatory in France. It was later named after French composer Claude Debussy.[2]

## Contents

* 1 Orbit and classification
* 2 Naming
* 3 Diameter and albedo
* 4 Rotation period
* 5 Satellite
* 6 References
* 7 External links

## Orbit and classification

Debussy is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the middle main-belt at a distance of 2.3–3.3 AU once every 4 years and 7 months (1,680 days; semi-major axis of 2.77 AU). Its orbit has an eccentricity of 0.18 and an inclination of 8° with respect to the ecliptic.[1] A first precovery was taken at Palomar Observatory in 1951, extending the body's observation arc by 37 years prior to its official discovery observation.[2]

## Naming

This minor planet was named in memory of French composer Claude Debussy (1862–1918), one of the most prominent figures associated with impressionist music, best known for his Clair de lune and Feux d'artifice, as well as for his piano suites Estampes (1903), Bergamasque (1890–1905) and Images (1905). He was a fervent admirer of Frédéric Chopin, after whom the asteroid 3784 Chopin was named.[2] The official naming citation was published on 4 October 1990 (M.P.C. 17031).[17]

## Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the Infrared Spectrograph of the Spitzer Space Telescope, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Debussy measures between 13.23 and 17.359 kilometers in diameter and its surface has an albedo between 0.039 and 0.07.[8][10][11][12][13][14] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 14.64 kilometers with an absolute magnitude of 12.9.[9]

## Rotation period

Between 2002 and 2016, a large number of rotational lightcurve of Debussy were obtained from photometric observations by predominantly Swiss, French and German astronomers. Best rated lightcurve analysis gave a rotation period of 26.606 hours with a brightness variation of 1.04–1.13 magnitude, which indicates that the body is highly elongated ({{{1}}}).[5][6][15]

## Satellite

In November 2002, during the first photometric observations by Swiss astronomer Raoul Behrend at Geneva Observatory in collaboration with several other European astronomers, it was revealed that Debussy is a synchronous binary system with a minor-planet moon in orbit (F-type binary). The satellite's orbital period is 26.606 hours, identical to the primary's rotation. The system's secondary-to-primary mean-diameter ratio is 0.643.[6] The Johnston archive derives a diameter of 9.39 kilometers for the moon, and estimates that it has a semi-major axis of approximately 31 kilometers.[7] After additional follow-up observations had been made, the discovery was announced on 21 March 2004.[6] The moon's provisional designation is S/2004 (4492) 1. The collaboration of astronomers from 26 observatories also discovered satellites in orbit of the main-belt asteroids 854 Frostia, 1089 Tama and 1313 Berna.[6]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 4492 Debussy (1988 SH)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004492.
2. ↑ 2.0 2.1 2.2 2.3 "4492 Debussy (1988 SH)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=4492.
3. ↑ 3.0 3.1 "Asteroid 4492 Debussy – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=4492.
4. ↑ "Debussy". Dictionary.com Unabridged. Random House. https://www.dictionary.com/browse/Debussy.
5. ↑ 5.0 5.1 5.2 Behrend, R. (June 2004). "(4492) Debussy". IAU Circ. 8354 (8354): 3. Bibcode: 2004IAUC.8354....3B.
6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Behrend, R.; Bernasconi, L.; Roy, R.; Klotz, A.; Colas, F.; Antonini, P. et al. (February 2006). "Four new binary minor planets: (854) Frostia, (1089) Tama, (1313) Berna, (4492) Debussy". Astronomy and Astrophysics 446 (3): 1177–1184. doi:10.1051/0004-6361:20053709. Bibcode: 2006A&A...446.1177B.
7. ↑ 7.0 7.1 Johnston, Robert (21 September 2014). "(4492) Debussy". johnstonsarchive.net. http://www.johnstonsarchive.net/astro/astmoons/am-04492.html.
8. ↑ 8.0 8.1 8.2 8.3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N.
9. ↑ 9.0 9.1 9.2 9.3 9.4 "LCDB Data for (4492) Debussy". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4492|Debussy.
10. ↑ 10.0 10.1 10.2 10.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
11. ↑ 11.0 11.1 11.2 11.3 11.4 Marchis, F.; Enriquez, J. E.; Emery, J. P.; Mueller, M.; Baek, M.; Pollock, J. et al. (November 2012). "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus 221 (2): 1130–1161. doi:10.1016/j.icarus.2012.09.013. Bibcode: 2012Icar..221.1130M.
12. ↑ 12.0 12.1 12.2 12.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M.
13. ↑ 13.0 13.1 13.2 13.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
14. ↑ 14.0 14.1 14.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M.
15. ↑ 15.0 15.1 15.2 Behrend, Raoul. "Asteroids and comets rotation curves – (4492) Debussy". Geneva Observatory. http://obswww.unige.ch/~behrend/page5cou.html#004492.
16. ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V.
17. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
* Lightcurve Database Query (LCDB), at www.minorplanet.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
* 4492 Debussy at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 4492 Debussy at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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