1602 Indiana

1602 Indiana, provisional designation 1950 GF, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter.

1602 Indiana
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date14 March 1950
Designations
(1602) Indiana
Named after
Indiana (U.S. state)[2]
1950 GF · 1943 DJ
1975 XR
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc74.27 yr (27,128 days)
Aphelion2.4796 AU
Perihelion2.0104 AU
2.2450 AU
Eccentricity0.1045
3.36 yr (1,229 days)
57.226°
0° 17m 34.8s / day
Inclination4.1618°
75.134°
73.437°
Physical characteristics
Dimensions7.970±0.810 km[4]
8.41±0.59 km[5]
8.515±0.047 km[6]
8.62 km (calculated)[3]
2.57±0.06 h[lower-alpha 1]
2.601±0.001 h[7]
2.610±0.001 h[8]
0.24 (assumed)[3]
0.2503±0.0493[6]
0.259±0.040[5]
0.297±0.095[4]
B–V = 0.930[1]
U–B = 0.550[1]
Tholen = S [1] · S [3]
12.49[1][3][5][6] · 12.57±0.24[9]

    It was discovered on 14 March 1950, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, in the United States.[10] It was later named after the U.S. state of Indiana and for Indiana University.[2]

    Classification and orbit

    Indiana is a member of the Flora family, a large collisional group of stony S-type asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,229 days). Its orbit has an eccentricity of 0.10 and an inclination of 4° with respect to the ecliptic.[1] Indiana was first identified as 1943 DJ at Turku Observatory in Finland, extending the body's observation arc by 7 years prior to its official discovery observation.[10]

    Physical characteristics

    Rotation period

    Three rotational lightcurves of Indiana were obtained from photometric observations taken by astronomer Michael Pietschnig, Gary Vander Haagen and Michael Fleenor in Spring 2007. The lightcurve analysis gave a rotation period between 2.57 and 2.61 hours with a change in brightness of 0.12 to 0.19 magnitude, respectively (U=2/3/3-).[lower-alpha 1][7][8]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Indiana measures between 7.97 and 8.52 kilometers in diameter, and its surface has an albedo between 0.250 and 0.297.[4][5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this family – and calculates a diameter of 8.62 kilometers with an absolute magnitude of 12.49.[3]

    Naming

    This minor planet was named for the U.S. state of Indiana and for Indiana University with its astronomy department, which is the parent institution of the discovering Goethe Link Observatory.[2]

    Originally the discovery was credited to Beryl H. Potter (1900–1985), after whom the asteroid 1729 Beryl is named. She was research assistant at the Indiana University, who participated in the program of minor planet observations from 1949 to 1966. During this period, she analysed nearly 6,300 photographic plates, measuring the positions of minor planets and reporting lost asteroids to IAU's Minor Planet Circulars (MPCs) for publication. However, according to Frank K. Edmondson (1912–2008), chairman of the Astronomy Department of Indiana University (also see 1761 Edmondson), there were several assistants involved in blinking the photographic plates during the first years of the program. The discovery was therefore credited to Indiana University, instead.[2] The official naming citation was published by the Minor Planet Center in January 1955 (M.P.C. 1171).[11]

    Notes
    1. Pietschnig (2011) web: rotation period 2.57±0.06 with a brightness amplitude of 0.19 in magnitude. See Pietschnig, M. (2011). Summary figures at Asteroid Lightcurve Database for (1602) Indiana

    References
    1. "JPL Small-Body Database Browser: 1602 Indiana (1950 GF)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2017.
    2. Schmadel, Lutz D. (2007). "(1602) Indiana". Dictionary of Minor Planet Names – (1602) Indiana. Springer Berlin Heidelberg. p. 127. doi:10.1007/978-3-540-29925-7_1603. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1602) Indiana". Asteroid Lightcurve Database (LCDB). Retrieved 29 December 2016.
    4. 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 29 December 2016.
    5. 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 17 October 2019. (online, AcuA catalog p. 153)
    6. 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.
    7. Vander Haagen, Gary A. (December 2007). "Lightcurves of Minor Planets 559 Nanon and 1602 Indiana". The Minor Planet Bulletin. 34 (4): 107. Bibcode:2007MPBu...34..107V. ISSN 1052-8091. Retrieved 29 December 2016.
    8. Fleenor, Michael L. (September 2007). "Asteroid Lightcurve Analysis from Volunteer Observatory December 2006 to April 2007". The Minor Planet Bulletin. 34 (3): 66–67. Bibcode:2007MPBu...34...66F. ISSN 1052-8091. Retrieved 29 December 2016.
    9. 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 29 December 2016.
    10. "1602 Indiana (1950 GF)". Minor Planet Center. Retrieved 29 December 2016.
    11. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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