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Aglaja (/əˈɡl.ə/; minor planet designation: 47 Aglaja) is a large, dark main belt asteroid. It was discovered by Robert Luther on 15 September 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]

47 Aglaja
Aglaja (asteroid).jpg
An image of Aglaja taken by the SDSS telescope on 13 October 1999. The minor planet was 1.7 AU from Earth at the time of photography.
Discovered byRobert Luther
Discovery dateSeptember 15, 1857
MPC designation(47) Aglaja
Named after
Main belt
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion488.740 Gm (3.267 AU)
Perihelion372.222 Gm (2.488 AU)
430.481 Gm (2.878 AU)
1,782.960 d (4.88 a)
Physical characteristics
Dimensions141.90 ± 8.72 km[2]
Mass(3.25±1.68)×1018 kg[2]
Mean density
2.17 ± 1.19 g/cm3[2]
13.175[3] h
0.080 [4]
C (Tholen)

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 16 September 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 calculated at the time of the occultation was 0.071 ± 0.002.[8]

2012 photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico 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]


  1. ^ Yeomans, Donald K., "47 Aglaja", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 2013-04-07.
  2. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
  3. ^ a b Pilcher, Frederick (October 2012), "Rotation Period Determinations for 47 Aglaja, 252 Clementina, 611 Valeria, 627 Charis, and 756 Lilliana", Minor Planet Bulletin, 39, pp. 220–222, Bibcode:2012MPBu...39..220P.
  4. ^ Asteroid Data Sets Archived 2010-01-17 at WebCite
  5. ^ a b Yang, Bin; Jewitt, David (September 2010), "Identification of Magnetite in B-type Asteroids", The Astronomical Journal, 140 (3), pp. 692–698, arXiv:1006.5110, Bibcode:2010AJ....140..692Y, doi:10.1088/0004-6256/140/3/692.
  6. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07.
  7. ^ Schmadel, Lutz (2003), Dictionary of minor planet names (fifth ed.), Germany: Springer, p. 19, ISBN 3-540-00238-3, retrieved 2008-12-29.
  8. ^ Millis, R. L.; et al. (October 1989), "The diameter, shape, albedo, and rotation of 47 Aglaja", Icarus, 81, pp. 375–385, Bibcode:1989Icar...81..375M, doi:10.1016/0019-1035(89)90058-4. See Table 1.

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