1665 Gaby

1665 Gaby, provisional designation 1930 DQ, is a stony asteroid and a relatively slow rotator from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 27 February 1930, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany.[12] It was later named after Gaby Reinmuth, the discoverer's daughter-in-law.[2]

1665 Gaby
Shape model of Gaby from its lightcurve
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date27 February 1930
Designations
(1665) Gaby
Named after
Gaby Reinmuth
(daughter-in-law of)
Karl Reinmuth[2]
1930 DQ · 1941 BC
1949 HS · 1951 WQ
1957 KF
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc87.04 yr (31,793 days)
Aphelion2.9145 AU
Perihelion1.9128 AU
2.4136 AU
Eccentricity0.2075
3.75 yr (1,370 days)
165.86°
0° 15m 46.08s / day
Inclination10.835°
91.543°
5.9166°
Physical characteristics
Dimensions10.746±0.179 km[4]
10.960±0.021 km[5]
11.009 km[6]
11.01 km (taken)[3]
66±2 h[7]
67.905±0.005 h[8]
67.911±0.005 h[9]
0.2532[6]
0.2681±0.0736[5]
0.278±0.049[4]
Tholen = S [1] · S [3][10]
B–V = 0.848[1]
U–B = 0.481[1]
11.85[1][5] · 11.9±0.2[3][6][11] · 12.19±0.97[10]

    Orbit and classification

    Gaby orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 9 months (1,370 days). Its orbit has an eccentricity of 0.21 and an inclination of 11° with respect to the ecliptic.[1] No precoveries were taken, and no prior identifications were made of Gaby. The body's observation arc begins 2 months after its official discovery observation at Heidelberg.[12]

    Physical characteristics

    In the Tholen classification, Gaby is a common S-type asteroid.[1]

    Lightcurves

    In February 2005, French amateur astronomer Laurent Bernasconi obtained a rotational lightcurve of Gaby from photometric observations. It gave a rotation period of 66 hours with a brightness variation of 0.27 magnitude (U=2).[7]

    This is a longer-than average rotation, since most minor planets have a period between 2 and 20 hours (see list). In 2016, concurring sidereal periods of 67.905 and 67.911 hours were obtained from modeled photometric observations derived from the Lowell Photometric Database and other sources (U=n.a.).[8][9]

    Diameter and albedo

    According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Gaby measures between 10.75 and 11.01 kilometers in diameter, and its surface has an albedo between 0.253 and 0.278.[4][5][6] The Collaborative Asteroid Lightcurve Link adopts Petr Pravec's revised WISE data with an albedo of 0.2532 and a diameter of 11.01 kilometers using an absolute magnitude of 11.9±0.2.[3][6]

    Naming

    This minor planet was named by the discoverer for his daughter-in-law, Gaby Reinmuth.[2] The official naming citation was published by the Minor Planet Center on 15 December 1968 (M.P.C. 2901).[13]

    References
    1. "JPL Small-Body Database Browser: 1665 Gaby (1930 DQ)" (2017-03-15 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
    2. Schmadel, Lutz D. (2007). "(1665) Gaby". Dictionary of Minor Planet Names – (1665) Gaby. Springer Berlin Heidelberg. p. 132. doi:10.1007/978-3-540-29925-7_1666. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1665) Gaby". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
    4. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 23 December 2016.
    5. 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.
    6. Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 23 December 2016.
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (1665) Gaby". Geneva Observatory. Retrieved 23 December 2016.
    8. Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738. Retrieved 23 December 2016.
    9. Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441.
    10. 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 23 December 2016.
    11. Harris, A. W.; Young, J. W.; Dockweiler, Thor; Gibson, J.; Poutanen, M.; Bowell, E. (January 1992). "Asteroid lightcurve observations from 1981". Icarus. 95 (1): 115–147.ResearchsupportedbyLowellObservatoryEndowmentandNASA. Bibcode:1992Icar...95..115H. doi:10.1016/0019-1035(92)90195-D. ISSN 0019-1035. Retrieved 23 December 2016.
    12. "1665 Gaby (1930 DQ)". Minor Planet Center. Retrieved 23 December 2016.
    13. 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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