984 Gretia
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984 Gretia /ˈɡriːtiə/ is a stony background asteroid from the central regions of the asteroid belt, approximately 32 kilometers (20 miles) in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 27 August 1922 and given the provisional designation 1922 MH.[17] The asteroid was named after Greta, sister-in-law of ARI-astronomer Albrecht Kahrstedt.[17]
Quick Facts Discovery, Discovered by ...
Discovery [1] | |
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Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 27 August 1922 |
Designations | |
(984) Gretia | |
Pronunciation | /ˈɡriːtiə/ |
Named after | Greta, sister-in-law of astronomer Albrecht Kahrstedt [2] |
1922 MH · 1973 LC A910 BA · A915 DA | |
main-belt · (middle) background | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 94.45 yr (34,499 days) |
Aphelion | 3.3562 AU |
Perihelion | 2.2495 AU |
2.8028 AU | |
Eccentricity | 0.1974 |
4.69 yr (1,714 days) | |
65.271° | |
0° 12m 36s / day | |
Inclination | 9.0930° |
314.21° | |
55.494° | |
Physical characteristics | |
Dimensions | 31.91±3.1 km[3][4] 32.449±0.306 km[5] 34.91±0.47 km[6] 36.600±0.187 km[7] |
5.560±0.018 h[8] 5.76 h[9] 5.778±0.001 h[10] 5.778026±0.000001 h[11] 5.77827±0.00005 h[10] 5.7789±0.0002 h[12] 5.780±0.001 h[13] 5.781 h[14][15] | |
0.3566±0.0863[7] 0.360±0.012[6] 0.421±0.038[5] 0.4239±0.095[3] | |
SMASS = Sr [1] · S [4] B–V = 0.950±0.030[8] | |
9.03[1][3][4][6][7] · 9.52±0.16[16] | |
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