375 Ursula
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| Discovery | |
|---|---|
| Discovered by | Auguste Charlois |
| Discovery date | September 18, 1893 |
| Designations | |
| Pronunciation | /ˈɜrsjʊlə/ or /ˈɜrsələ/[1] |
| Alternative names | 1893 AL |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 3.46 AU (517.593 Gm) |
| Perihelion | 2.789 AU (417.247 Gm) |
| Semi-major axis | 3.125 AU (467.42 Gm) |
| Eccentricity | 0.107 |
| Orbital period | 5.52 a (2017.268 d) |
| Average orbital speed | 16.85 km/s |
| Mean anomaly | 85.323° |
| Inclination | 15.931° |
| Longitude of ascending node | 336.686° |
| Argument of perihelion | 344.757° |
| Physical characteristics | |
| Dimensions |
216±10 km[2][3][4] 191.65 ± 4.01[5] km |
| Mass | (8.45 ± 5.26) × 1018[5] kg |
| Mean density | 2.29 ± 1.43[5] g/cm3 |
| Rotation period | 16.83 hr[3] |
| Absolute magnitude (H) | 7.47[3] |
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375 Ursula is one of the largest asteroids from the asteroid belt. It was discovered by Auguste Charlois on September 18, 1893, in Nice.
Observations of an occultation on November 15, 1984, produced six chords indicating an estimated diameter of 216±10 km.[2]
Asteroid 375 Ursula (apparent magnitude 11.4) near the star TYC 581-36-1 (magnitude 11.9). The two galaxies are about magnitude 15.
References
- ↑ UR-sew-lə or UR-sə-lə
- ↑ 2.0 2.1 Millis, R.L; Wasserman, Bowell, Franz, Klemola, Dunham (1984). "The diameter of 375 URSULA from its occultation of AG + 39 deg 303". Astronomical Journal 89: 592–596. Bibcode:1984AJ.....89..592M. doi:10.1086/113553.
- ↑ 3.0 3.1 3.2 "JPL Small-Body Database Browser: 375 Ursula (1893 AL)". Retrieved 2008-05-22.
- ↑ "Occultation of UCAC2 12060928 by 375 Ursula". Royal Astronomical Society of New Zealand. 2008-05-27. Retrieved 2008-11-30.
- ↑ 5.0 5.1 5.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
External links
- Orbital simulation from JPL (Java) / Ephemeris
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