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1628 Strobel (provisional designation 1923 OG) is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 55 kilometers in diameter.
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 11 September 1923 |
| Designations | |
| (1628) Strobel | |
Named after | Willi Strobel (astronomer)[2] |
| 1923 OG · 1926 GY 1947 GC · 1949 QA2 1952 DV2 · 1957 CA 1960 WH | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.11 yr (34,007 days) |
| Aphelion | 3.2152 AU |
| Perihelion | 2.8088 AU |
| 3.0120 AU | |
| Eccentricity | 0.0675 |
| 5.23 yr (1,909 days) | |
| 244.38° | |
| 0° 11m 18.6s / day | |
| Inclination | 19.387° |
| 181.19° | |
| 289.14° | |
| Physical characteristics | |
| Dimensions | 51.15±14.91 km[4] 53.147±0.793 km[5] 54.26±16.39 km[6] 56.58±0.68 km[7] 57.06 km (derived)[3] 57.12±1.7 km (IRAS:12)[8] 59.345±0.484 km[9] |
| 9.52±0.01 h[10] 11.80 h[11] | |
| 0.047±0.010[9] 0.05±0.03[6] 0.0504 (derived)[3] 0.0532±0.003 (IRAS:12)[8] 0.055±0.002[7] 0.0581±0.0113[5] 0.06±0.04[4] | |
| P[5] · X[12] · C[3] B–V = 0.840[1] U–B = 0.320[1] | |
| 10.02[1][6][7][8] · 10.08[3][5][11] · 10.31±0.20[12] · 10.32[4] | |
It was discovered on 11 September 1923, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after ARI-astronomer Willi Strobel.[2][13]
Strobel orbits the Sun in the outer main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,909 days). Its orbit has an eccentricity of 0.07 and an inclination of 19° with respect to the ecliptic.[1] Strobel's observation arc begins two nights after its official discovery observation at Heidelberg in 1923.[13]
Strobel is a carbonaceous C-type asteroid. It is also classified as a P-type by WISE and as an X-type asteroid by Pan-STARRS.[5][12]
Rotation period
American astronomer Richard Binzel obtained the first rotational lightcurve of Strobel in May 1984. It gave a rotation period of 11.80 hours with a brightness amplitude of 0.22 magnitude (U=2).[11] In May 2005, photometric observations by French amateur astronomer Laurent Bernasconi gave a shorter period of 9.52 hours and a brightness change of 0.20 magnitude (U=2).[10]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Strobel measures between 51.15 and 59.35 kilometers in diameter, and its surface has an albedo between 0.047 and 0.06.[4][5][6][7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0504 and a diameter of 57.06 kilometers with an absolute magnitude of 10.08.[3]
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This minor planet was named in honor of Willi Strobel (1909–1988), staff member at Astronomisches Rechen-Institut (ARI) since 1938, and author of the 1963-edition of Identifizierungsnachweis der Kleinen Planeten (Minor planet identifications, published by ARI).[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931).[14]
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