1005 Arago

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1005 Arago
Discovery [1]
Discovered by S. Belyavskyj
Discovery site Simeiz Obs.
Discovery date 5 September 1923
MPC designation (1005) Arago
Named after
François Arago
(French mathematician)[2]
1923 OT
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 93.51 yr (34,156 days)
Aphelion 3.5381 AU
Perihelion 2.7937 AU
3.1659 AU
Eccentricity 0.1176
5.63 yr (2,058 days)
0° 10m 30s / day
Inclination 19.060°
Physical characteristics
Dimensions 48.57±14.27 km[4]
50.28±15.89 km[5]
52.74±0.89 km[6]
56.36±1.36 km[7]
57.69 km (derived)[3]
57.82±4.9 km[8]
61.132±0.345 km[9]
68.404±0.660 km[10]
8.7819±0.0001 h[a]
8.784±0.001 h[11]
0.0582 (derived)[3]
P[10] · C[3]
9.7[7][8][10] · 9.9[1][3][4][6] · 9.98[5]

1005 Arago, provisional designation 1923 OT, is a dark asteroid from the outer regions of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 5 September 1923, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula.[12] The asteroid was named after French mathematician François Arago.[2]

Classification and orbit[edit]

Arago orbits the Sun in the outer main-belt at a distance of 2.8–3.5 AU once every 5 years and 8 months (2,058 days). Its orbit has an eccentricity of 0.12 and an inclination of 19° with respect to the ecliptic.[1] The asteroid's observation arc begins at Uccle Observatory in 1935, twelve years after its official discovery observation at Simeiz.[12]

Physical characteristics[edit]

Diameter and albedo[edit]

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer (WISE) with its subsequent NEOWISE mission, Arago measures between 48.57 and 68.404 kilometers in diameter and its surface has an albedo between 0.0498 and 0.08.[4][5][6][7][8][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0582 and a diameter of 57.69 kilometers based on an absolute magnitude of 9.9.[3]


In October 2010, a rotational lightcurve of Arago was obtained from photometric observations that was later submitted to the CALL website. Lightcurve analysis gave a rotation period of 8.7819 hours with a brightness amplitude of 0.22 magnitude (U=n.a.).[a] In April 2016, another lightcurve was obtained by the group of Spanish amateur astronomers OBAS. It gave a concurring period of 8.784 hours with an amplitude of 0.22 magnitude (U=3).[11]

Spectral type[edit]

Arago is characterized by WISE as a dark and reddish P-type asteroid. It is also a carbonaceous C-type asteroid as generically assumed by CALL.[3][10]


This minor planet was named after French mathematician François Arago (1786–1853) director of the Paris Observatory.[2] He is also honored by an inner ring of Neptune, the crater Arago on the Moon and the crater Arago on Mars. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 96).[13]


  1. ^ a b CALL (2002): Submitted observations to the CALL website with a rotation period 8.7819±0.0001 hours with a brightness amplitude of 0.22 mag. Summary figures for (1005) Arago at Collaborative Asteroid Lightcurve Link (CALL)


  1. ^ a b c d "JPL Small-Body Database Browser: 1005 Arago (1923 OT)" (2017-07-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 August 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1005) Arago. Springer Berlin Heidelberg. p. 87. ISBN 978-3-540-00238-3. Retrieved 6 August 2017. 
  3. ^ a b c d e f g "LCDB Data for (1005) Arago". Asteroid Lightcurve Database (LCDB). Retrieved 6 August 2017. 
  4. ^ a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522Freely accessible. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 6 August 2017. 
  5. ^ a b c d 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. arXiv:1606.08923Freely accessible. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 6 August 2017. 
  6. ^ a b c d 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. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 6 August 2017. 
  7. ^ a b c d 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 6 August 2017. 
  8. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 6 August 2017. 
  9. ^ Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 6 August 2017. 
  10. ^ a b c d e f Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 6 August 2017. 
  11. ^ a b Mansego, Enrique Arce; Rodriguez, Pedro Brines; de Haro, Juan Lozano; Chiner, Onofre Rodrigo; Silva, Alvaro Fornas; Porta, David Herrero; et al. (October 2016). "Eighteen Asteroids Lightcurves at Asteroides Observers (OBAS) - MPPD: 2016 March-May". The Minor Planet Bulletin. 43 (4): 332–336. Bibcode:2016MPBu...43..332M. ISSN 1052-8091. Retrieved 6 August 2017. 
  12. ^ a b "1005 Arago (1923 OT)". Minor Planet Center. Retrieved 6 August 2017. 
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 August 2017. 

External links[edit]