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3728 IRAS, provisional designation 1983 QF, is a stony asteroid from the middle region of the asteroid belt, approximately 20 kilometers in diameter. On 23 August 1983, it was discovered by and later named after IRAS, a spaceborne all-sky infrared survey satellite.[10]

3728 IRAS
Discovery [1]
Discovered byIRAS
Discovery date23 August 1983
MPC designation(3728) IRAS
Named after
IRAS (space observatory)[2]
1983 QF · 1948 RN
1963 FA · 1972 FH
1976 GL · 1985 GT
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc68.74 yr (25,108 days)
Aphelion3.2138 AU
Perihelion2.0862 AU
2.6500 AU
4.31 yr (1,576 days)
0° 13m 42.6s / day
Physical characteristics
Dimensions19.41 km (derived)[3]
19.55±1.7 km (IRAS:12)[1]
19.83±0.38 km[4]
21.40±0.38 km[5]
27.480±0.177 km[7]
8.323±0.002 h[8]
0.0815 (derived)[3]
0.1161±0.023 (IRAS:12)[1]
CX [9] · S[3]
11.50[5][7] · 11.80[4] · 11.9[1][3] · 12.20±0.23[9]


Classification and orbitEdit

The S-type asteroid is also classified as a CX-type by Pan-STARRS' large-scale survey.[9] It orbits the Sun in the central main-belt at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,576 days). Its orbit has an eccentricity of 0.21 and an inclination of 23° with respect to the ecliptic.[1] The first used precovery was taken at Palomar Observatory in 1950, extending the asteroid's observation arc by 33 years prior to its discovery.[10]

Rotation periodEdit

In August 2008, a photometric lightcurve analysis by U.S. astronomer Brian Warner at his Palmer Divide Observatory (716), Colorado, gave a well-defined rotation period of 8.323±0.002 hours with a brightness amplitude of 0.21 in magnitude (U=3).[8]

Diameter estimatesEdit

According to 12 observations by the discovering Infrared Astronomical Satellite, IRAS, the asteroid has an albedo of 0.12 and a diameter of 19.6 kilometers. The Collaborative Asteroid Lightcurve Link derives similar figures, as do the space-based surveys carried out by the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer.[3][5][4] Two publications from the post-cryogenic NEOWISE mission find a larger diameter of 23.4 and 27.5 kilometers, respectively.[6][7]


This minor planet was named for the discovering Infrared Astronomical Satellite (IRAS), a collaboration between the United States (NASA), the Netherlands (NIVR), and the United Kingdom (SERC), which observed more than 250,000 celestial bodies in the infrared at wavelengths between 12 and 100 µm during 10 months in 1983. IRAS has also discovered two other minor planets, the 11-kilometer sized main-belt asteroid (10714) 1983 QG[11] and 3200 Phaethon, a near-Earth and potentially hazardous object, parent body of the Geminid meteor shower, as well as six comets, such as 126P/IRAS, a short-period Jupiter family comet, which was also named after the discovering space observatory.[2][12] The approved naming citation was published by the Minor Planet Center on 4 May 1999 (M.P.C. 34619).[13]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 3728 IRAS (1983 QF)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(3728) Iras". Dictionary of Minor Planet Names – (3728) IRAS. Springer Berlin Heidelberg. p. 315. doi:10.1007/978-3-540-29925-7_3725. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (3728) IRAS". Asteroid Lightcurve Database (LCDB). Retrieved 1 February 2016.
  4. ^ 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 1 February 2016.
  5. ^ 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 1 February 2016.
  6. ^ a b c 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:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 5 December 2016.
  7. ^ a b c d 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 1 February 2016.
  8. ^ a b Warner, Brian D. (January 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September". The Minor Planet Bulletin. 36 (1): 7–13. Bibcode:2009MPBu...36....7W. ISSN 1052-8091. Retrieved 1 February 2016.
  9. ^ a b c 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 3 July 2016.
  10. ^ a b "3728 IRAS (1983 QF)". Minor Planet Center. Retrieved 1 February 2016.
  11. ^ "10714 (1983 QG)". Minor Planet Center. Retrieved 3 July 2016.
  12. ^ "JPL Small-Body Database Browser: 126P/IRAS". Jet Propulsion Laboratory. Retrieved 1 February 2016.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 3 July 2016.

External linksEdit