1665 Gaby
Main-belt asteroid
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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]
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Shape model of Gaby from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 27 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 arc | 87.04 yr (31,793 days) |
| Aphelion | 2.9145 AU |
| Perihelion | 1.9128 AU |
| 2.4136 AU | |
| Eccentricity | 0.2075 |
| 3.75 yr (1,370 days) | |
| 165.86° | |
| 0° 15m 46.08s / day | |
| Inclination | 10.835° |
| 91.543° | |
| 5.9166° | |
| Physical characteristics | |
| Dimensions | 10.746±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]
