Astronomy:95 Arethusa
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Short description: Main-belt asteroid
.png) A three-dimensional model of 95 Arethusa based on its light curve. | |
| Discovery | |
|---|---|
| Discovered by | Karl Theodor Robert Luther |
| Discovery date | 23 November 1867 |
| Designations | |
| (95) Arethusa | |
| Pronunciation | /ærəˈθjuːsə/[1] |
| Minor planet category | Main belt |
| Adjectives | Arethusian,[2] Arethusean[3] /ˌærəˈθjuːziən/ |
| Orbital characteristics [4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 143.53 yr (52424 d) |
| |{{{apsis}}}|helion}} | 3.53176 astronomical unit|AU (528.344 Gm) |
| |{{{apsis}}}|helion}} | 2.59737 AU (388.561 Gm) |
| 3.06457 AU (458.453 Gm) | |
| Eccentricity | 0.15245 |
| Orbital period | 5.36 yr (1959.5 d) |
| Average Orbital speed | 16.91 km/s |
| Mean anomaly | 250.185° |
| Mean motion | 0° 11m 1.385s / day |
| Inclination | 12.9955° |
| Longitude of ascending node | 243.038° |
| 154.196° | |
| Physical characteristics | |
| Dimensions | 136.04±10.1 km [4] 136.04 km† 147 ± 32 km [5] |
| Mass | 2.6×1018 kg |
Equatorial surface gravity | 0.0380 m/s² |
Equatorial escape velocity | 0.0719 km/s |
| Rotation period | 8.705 h (0.3627 d) |
| Geometric albedo | 0.0698±0.012 [4] 0.070 [6] |
| C | |
| Absolute magnitude (H) | 8.0 |
Arethusa (minor planet designation: 95 Arethusa) is a large main-belt asteroid. It was discovered by German astronomer Robert Luther on 23 November 1867, and named after one of the various Arethusas in Greek mythology. Arethusa has been observed occulting a star three times:[7] first on 2 February 1998, and twice in January 2003.[citation needed]
This object is orbiting the Sun with a period of 5.36 years and an eccentricity of 0.15. The cross-section diameter is around 136 km and it is spinning with a rotation period of 8.7 hours. The spectrum matches a C-type asteroid, indicating a dark surface with a primitive carbonaceous composition.
References
- ↑ Benjamin Smith (1903) The Century Dictionary and Cyclopedia
- ↑ White & Riddle (1904) A Latin-English Dictionary for the Use of Junior Students
- ↑ Lucas Carpenter (1989) Selected Essays of Fletcher, p. 186
- ↑ 4.0 4.1 4.2 "95 Arethusa". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=95;cad=1.
- ↑ Ďurech, Josef; Kaasalainen, Mikko; Herald, David; Dunham, David; Timerson, Brad; Hanuš, Josef et al. (2011). "Combining asteroid models derived by lightcurve inversion with asteroidal occultation silhouettes". Icarus 214 (2): 652–670. doi:10.1016/j.icarus.2011.03.016. Bibcode: 2011Icar..214..652D. http://astro.troja.mff.cuni.cz/projects/asteroids3D/download/durech_et_al_2011_occ_paper.pdf. Retrieved 26 January 2012.
- ↑ "Asteroid Data Sets". http://www.psi.edu/pds/resource/albedo.html.
- ↑ Herald, David et al. (October 2020), "Precise astrometry and diameters of asteroids from occultations - a data set of observations and their interpretation", Monthly Notices of the Royal Astronomical Society 499 (3): 4570–4590, doi:10.1093/mnras/staa3077, Bibcode: 2020MNRAS.499.4570H
External links
- Asteroid Occultation Results for North America on 2008/04/16 with 2 chords
- 95 Arethusa at AstDyS-2, Asteroids—Dynamic Site
- 95 Arethusa at the JPL Small-Body Database
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