1741 Giclas

1741 Giclas (prov. designation: 1960 BC) is a stony Koronis asteroid from the outer region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 26 January 1960, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States.[12] It is named for astronomer Henry L. Giclas.[2]

1741 Giclas
Shape model of Giclas from its lightcurve
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date26 January 1960
Designations
(1741) Giclas
Named after
Henry Giclas (astronomer) [2]
1960 BC · 1953 UY
1953 VH1 · 1953 XN
1963 YD
main-belt · Koronis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.20 yr (23,084 days)
Aphelion3.0879 AU
Perihelion2.6812 AU
2.8846 AU
Eccentricity0.0705
4.90 yr (1,789 days)
17.734°
0° 12m 4.32s / day
Inclination2.8876°
55.514°
338.82°
Physical characteristics
Dimensions12.501±0.245 km[4]
13.11±0.18 km[5]
13.60 km (calculated)[3]
15.06±1.04 km[6]
2.92±0.02 h[7]
2.938±0.001 h[8][lower-alpha 1]
2.943±0.001 h[9]
3.107±0.005 h[10]
0.24 (assumed)[3]
0.260±0.049[5]
0.265±0.039[6]
0.374±0.048
0.3742±0.0483[4]
S [3]
V–R = 0.456±0.015[9]
11.11±0.04 (R)[9] · 11.2[4][6] · 11.36±0.13[11] · 11.49[5] · 11.5[1][3]

    Orbit and classification

    The S-type asteroid is a member of the Koronis family, a group consisting of about 200 known bodies. It orbits the Sun in the outer main-belt at a distance of 2.7–3.1 AU once every 4 years and 11 months (1,789 days). Its orbit has an eccentricity of 0.07 and an inclination of 3° with respect to the ecliptic.[1] Its first used observation was taken at Goethe Link Observatory in 1953, extending the body's observation arc by 7 years prior to its official discovery observation.[12]

    Physical characteristics

    Rotation period

    Between 2004 and 2014, several lightcurves[lower-alpha 1] of Giclas gave a rotation period between 2.92 and 3.107 hours with an brightness variation between 0.10 and 0.15 magnitude (U=3-/3/3/2).[7][8][9][10]

    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, Giclas measures 12.50 and 15.06 kilometers in diameter, and its surface has an albedo in the range of 0.260 to 0.374.[4][5][6]

    The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and calculates a diameter of 13.60 kilometers with an absolute magnitude of 11.5.[3]

    Naming

    This minor planet was named in honour of American astronomer Henry Lee Giclas (1910–2007), longtime staff member of the Lowell Observatory in Flagstaff, Arizona, where he discovered 17 minor planets and the comet 84P/Giclas. Giclas responsibility included the programs of minor planet positions and stellar proper motions, using the 13-inch Lawrence Lowell Telescope.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3934).[13]

    Notes
    1. Lightcurve plot of 1741 Giclas taken at the Palmer Divide Observatory by B. D. Warner (2007)

    References
    1. "JPL Small-Body Database Browser: 1741 Giclas (1960 BC)" (2016-12-25 last obs.). Jet Propulsion Laboratory. Retrieved 7 June 2017.
    2. Schmadel, Lutz D. (2007). "(1741) Giclas". Dictionary of Minor Planet Names – (1741) Giclas. Springer Berlin Heidelberg. p. 138. doi:10.1007/978-3-540-29925-7_1742. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1741) Giclas". Asteroid Lightcurve Database (LCDB). Retrieved 20 December 2016.
    4. 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.
    5. 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 20 December 2016.
    6. 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)
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (1741) Giclas". Geneva Observatory. Retrieved 20 December 2016.
    8. Warner, Brian D. (June 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: September-December 2007". The Minor Planet Bulletin. 35 (2): 67–71. Bibcode:2008MPBu...35...67W. ISSN 1052-8091. Retrieved 20 December 2016.
    9. Slivan, Stephen M.; Binzel, Richard P.; Boroumand, Shaida C.; Pan, Margaret W.; Simpson, Christine M.; Tanabe, James T.; et al. (May 2008). "Rotation rates in the Koronis family, complete to H≈11.2". Icarus. 195 (1): 226–276. Bibcode:2008Icar..195..226S. doi:10.1016/j.icarus.2007.11.019. Retrieved 20 December 2016.
    10. Oey, Julian (January 2016). "Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2014". The Minor Planet Bulletin. 43 (1): 45–51. Bibcode:2016MPBu...43...45O. ISSN 1052-8091. Retrieved 20 December 2016.
    11. 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 20 December 2016.
    12. "1741 Giclas (1960 BC)". Minor Planet Center. Retrieved 20 December 2016.
    13. Schmadel, Lutz D. (2009). "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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