27 Euterpe
Main-belt asteroid
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27 Euterpe is a stony asteroid and parent body of the Euterpe family, located in the inner asteroid belt, approximately 100 kilometers in diameter. It was discovered by English astronomer John Russell Hind at George Bishop's Observatory in London on 8 November 1853. The asteroid was named after Euterpe, the Muse of music in Greek mythology.[3][22]
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Lightcurve-based 3D-model of Euterpe | |
| Discovery[1] | |
|---|---|
| Discovered by | J. R. Hind |
| Discovery site | George Bishop's Obs. |
| Discovery date | 8 November 1853 |
| Designations | |
| (27) Euterpe | |
| Pronunciation | /juËËtÉËrpiË/[2] |
Named after | Euterpe (Greek mythology)[3] |
| 1945 KB | |
| main-belt · (inner)[4] Euterpe[5] | |
| Adjectives | Euterpean /juËËtÉËrpiÉn/[6] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 163.48 yr (59,711 days) |
| Aphelion | 2.7524 AU |
| Perihelion | 1.9401 AU |
| 2.3463 AU | |
| Eccentricity | 0.1731 |
| 3.59 yr (1,313 days) | |
| 170.66° | |
| 0° 16m 27.12s / day | |
| Inclination | 1.5837° |
| 94.789° | |
| 356.55° | |
| Physical characteristics | |
| Dimensions | 124 à 75 km (occultation)[1] 96 km[1] 96.9 km[7] 105.80±7.23 km[8] 109.79±1.54 km[9] 118 km[10] 118.000±22.30 km[11] |
| Mass | (1.67±1.01)Ã1018 kg[8] |
Mean density | 2.69±1.71 g/cm3[8] |
| 8.500 h[4] 10.377±0.008 h[12] 10.40193±0.00005 h[13] 10.404±0.001 h[4] 10.407±0.002 h[14] 10.4082±0.0001 h[15] 10.410±0.002 h[16][17][a] 10.41 h[18] | |
| 0.20±0.03[19] 0.2011±0.0582[11] 0.215±0.033[20] 0.234±0.008[9] 0.298[7] | |
| Tholen = S[1] SMASS = S[1] · S[21][4] BâV = 0.878[1] UâB = 0.502[1] | |
| 7.00[1][4][7][9][11] · 7.01±0.02[15] | |
| 0.13" to 0.035" | |
Euterpe is one of the brightest asteroids in the night sky.[23] It had an apparent magnitude of 8.5 during a perihelic opposition on 25 December 2015 when the asteroid was about 1 AU from Earth.[24] At the end of November 2022 it passed about 1.5 degrees from Uranus while in the constellation of Aries.[25] Based on the S-type spectra the composition appears stony. It has a cross-section size of around 100â120 km. 27 Euterpe is orbiting the Sun with a period of 3.59 years and is spinning on its axis once every 10.4 hours.
It is the parent body of the Euterpe family (410), a stony inner-belt asteroid family of nearly 400 known members.[5][26]:â23â Euterpe has been studied by radar.[27]
Notes
- Lightcurve plot of 27 Euterpe[dead link], R. D. Stephens (lead) and B. D. Warner at the Palmer Divide Observatory (2000): rotation period 10.410±0.002 hours with a brightness amplitude of 0.21±0.01 mag. Summary figures at the LCDB
