3728 IRAS

3728 IRAS
Discovery [1]
Discovered by IRAS
Discovery date 23 August 1983
Designations
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 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 66.77 yr (24,386 days)      
Aphelion 3.2135 AU
Perihelion 2.0846 AU
2.6490 AU
Eccentricity 0.2130
4.31 yr (1,575 days)
139.21°
Inclination 22.596°
167.37°
281.09°
Physical characteristics
Dimensions 19.55±1.7 km (IRAS:12)[3]
21.40±0.38 km[4]
27.480±0.177 km[5]
19.83±0.38 km[6]
19.41 km (derived)[3]
8.323±0.002 h[7]
0.1161±0.023 (IRAS:12)[3]
0.101±0.004[4]
0.0352±0.0015[5]
0.086±0.015[6]
0.0815 (derived)[3]
S [3]
11.9[1]

    3728 IRAS, provisional designation 1983 QF, is a stony asteroid from the middle region of the asteroid belt, about 20 kilometers in diameter. On 23 August 1983, it was discovered by and later named after IRAS, a spaceborne all-sky infrared survey satellite.[8]

    The S-type asteroid orbits the Sun at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,575 days). Its orbit shows an eccentricity of 0.21 and an inclination of 23 degrees from the plane of the ecliptic.[1] In 2008, a photometric light-curve analysis by U.S. astronomer Brian Warner at his Palmer Divide Observatory (716), Colorado, gave a rotation period of 8.323±0.002 hours with a brightness amplitude of 0.21 in magnitude.[7]

    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][4][6] Only the post-cryogenic NEOWISE mission finds a much lower albedo of 0.035 and, correspondingly, a larger diameter of 27.5 kilometers.[5]

    The minor planet was named for the discovering Infrared Astronomical Satellite (IRAS), a joint project of the United States, the Netherlands, and the United Kingdom. In 1983, the infrared survey satellite observed more than 250,000 celestial bodies in the infrared at wavelengths between 12 and 100 µm over its ten-month lifespan. IRAS has discovered three asteroids, including the near-Earth and potentially hazardous object, 3200 Phaethon, parent body of the Geminid meteor shower, as well as 4 long-period and 2 short-period comets, such as 126P/IRAS, a Jupiter family comet, which was also named after the discovering space observatory.[2][9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 3728 IRAS (1983 QF)" (2015-06-14 last obs.). Jet Propulsion Laboratory. Retrieved February 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3728) IRAS. Springer Berlin Heidelberg. p. 315. ISBN 978-3-540-00238-3. Retrieved February 2016.
    3. 1 2 3 4 5 6 7 "LCDB Data for (3728) IRAS". Asteroid Lightcurve Database (LCDB). Retrieved February 2016.
    4. 1 2 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved February 2016.
    5. 1 2 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved February 2016.
    6. 1 2 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. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved February 2016.
    7. 1 2 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 February 2016.
    8. ↑ "3728 IRAS (1983 QF)". Minor Planet Center. Retrieved February 2016.
    9. ↑ "JPL Small-Body Database Browser: 126P/IRAS". Jet Propulsion Laboratory. Retrieved February 2016.

    External links


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