47 Aglaja
.jpg) This is an image of Aglaja taken by the SDSS telescope on 13 October 1999 when it was 1.7 AU from Earth/Fermats Brother | |
| Discovery | |
|---|---|
| Discovered by | Robert Luther |
| Discovery date | September 15, 1857 |
| Designations | |
Named after | Aglaea |
| Main belt | |
| Orbital characteristics[1] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 488.740 Gm (3.267 AU) |
| Perihelion | 372.222 Gm (2.488 AU) |
| 430.481 Gm (2.878 AU) | |
| Eccentricity | 0.135 |
| 1,782.960 d (4.88 a) | |
Average orbital speed | 17.48 km/s |
| 225.007° | |
| Inclination | 4.985° |
| 3.244° | |
| 314.589° | |
| Physical characteristics | |
| Dimensions | 141.90 ± 8.72[2] km |
| Mass | (3.25 ± 1.68) × 1018[2] kg |
Mean density | 2.17 ± 1.19[2] g/cm3 |
| 0.0355 m/s² | |
| 0.0671 km/s | |
| 13.175[3] h | |
| Albedo | 0.080 [4] |
| Temperature | ~164 K |
Spectral type | C (Tholen) B[5] (SMASS II) |
| 7.84 | |
47 Aglaja /əˈɡlaɪ.ə/ is a large, dark main belt asteroid. It was discovered by Robert Luther on September 15, 1857 from Düsseldorf.[6] The name was chosen by the Philosophical Faculty of the University of Bonn and refers to Aglaea, one of the Charites in Greek mythology.[7]
Based upon its spectrum, 47 Aglaja is listed as a C-type asteroid under the Tholen classification taxonomy, indicating a carbonaceous composition. The SMASS classification system rates it as a rare B-type asteroid. There is a broad absorption feature at 1 μm that is associated with the presence of magnetite and is what gives the asteroid its blue tint.[5]
On September 16, 1984, the star SAO 146599 was occulted by 47 Aglaja. This event was observed from 13 sites in the continental United States, allowing a cross-sectional profile to be determined. Based upon this study, the asteroid has a diameter of 136.4 ± 1.2 km. The geometric albedo at the time of the occultation was 0.071 ± 0.002.[8]
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico during 2012 gave a light curve with a period of 13.175 ± 0.002 hours and a brightness variation of 0.09 ± 0.01 in magnitude. This result is in agreement with previous studies.[3]
References
- ^ Yeomans, Donald K., "47 Aglaja", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 2013-04-07.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ^ a b Pilcher, Frederick (October 2012), "Rotation Period Determinations for 47 Aglaja, 252 Clementina, 611 Valeria, 627 Charis, and 756 Lilliana", Minor Planet Bulletin, vol. 39, pp. 220–222, Bibcode:2012MPBu...39..220P.
- ^ Asteroid Data Sets
- ^ a b Yang, Bin; Jewitt, David (September 2010), "Identification of Magnetite in B-type Asteroids", The Astronomical Journal, vol. 140, no. 3, pp. 692–698, arXiv:1006.5110, Bibcode:2010AJ....140..692Y, doi:10.1088/0004-6256/140/3/692.
- ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07.
- ^ Schmadel, Lutz (2003), Dictionary of minor planet names (fifth ed.), Germany: Springer, p. 19, ISBN 3-540-00238-3, retrieved 2008-12-29.
- ^ Millis, R. L.; et al. (October 1989), "The diameter, shape, albedo, and rotation of 47 Aglaja", Icarus, vol. 81, pp. 375–385, Bibcode:1989Icar...81..375M, doi:10.1016/0019-1035(89)90058-4. See Table 1.
