43 Ariadne
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| Discovery | |
|---|---|
| Discovered by | N. R. Pogson |
| Discovery date | April 15, 1857 |
| Designations | |
| Named after | Ariadne |
| Alternative names | none |
| Minor planet category | Main belt (Flora family) |
| Orbital characteristics | |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 384.954 Gm (2.573 AU) |
| Perihelion | 274.339 Gm (1.834 AU) |
| Semi-major axis | 329.646 Gm (2.204 AU) |
| Eccentricity | 0.168 |
| Orbital period | 1194.766 d (3.27 a) |
| Average orbital speed | 19.92 km/s |
| Mean anomaly | 101.582° |
| Inclination | 3.464° |
| Longitude of ascending node | 264.937° |
| Argument of perihelion | 15.948° |
| Physical characteristics | |
| Dimensions | 95×60×50 km[1][2][3] |
| Mass | (1.21 ± 0.22) × 1018[4] kg |
| Mean density |
~2.7 g/cm³ (estimate)[5] 8.99 ± 2.57[4] g/cm3 |
| Equatorial surface gravity | ~0.012 m/s² (estimate) |
| Escape velocity | ~0.034 km/s (estimate) |
| Rotation period | 0.2401 d[6] |
| Albedo | 0.274 (geometric)[7] |
| Temperature |
~178 K (−95 °C) max: 275 K (2 °C) |
| Spectral type | S-type asteroid |
| Apparent magnitude | 8.8[8] to 13.42 |
| Absolute magnitude (H) | 7.93 |
| Angular diameter | 0.11″ to 0.025″ |
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43 Ariadne /ˌæriˈædniː/ is a fairly large and bright main-belt asteroid. It is the second-largest member of the Flora asteroid family. It was discovered by N. R. Pogson on April 15, 1857, and named after the Greek heroine Ariadne.
Characteristics
Ariadne is very elongate (almost twice as long as its smallest dimension) and probably bi-lobed[3] or at least very angular. It is a retrograde rotator, although its pole points almost parallel to the ecliptic towards ecliptic coordinates (β, λ) = (-15°, 253°) with a 10° uncertainty.[2] This gives an axial tilt of about 105°.
Trivia
- For reasons unknown, "Asteroid 43 Ariadne" was included in a list of names of supporters of the NASA spacecraft Stardust that was stored on a microchip within the spacecraft.
- The maximum apparent size of Ariadne is equivalent to the maximum apparent size of Pluto.
References
- ↑ http://www.psi.edu/pds/archive/simps.html
- ↑ 2.0 2.1 Kaasalainen, M.; Torppa, J.; Piironen, J. (2002). "Models of Twenty Asteroids from Photometric Data". Icarus 159 (2): 369–395. Bibcode:2002Icar..159..369K. doi:10.1006/icar.2002.6907.
- ↑ 3.0 3.1 Tanga, P.; et al. (2003). "Asteroid observations with the Hubble Space Telescope". Astronomy & Astrophysics 401 (2): 733–741. Bibcode:2003A&A...401..733T. doi:10.1051/0004-6361:20030032.
- ↑ 4.0 4.1 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.
- ↑ Krasinsky, G. A.; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus 158 (1): 98–105. Bibcode:2002Icar..158...98K. doi:10.1006/icar.2002.6837.
- ↑ PDS lightcurve data
- ↑ Supplemental IRAS Minor Planet Survey
- ↑ "AstDys (43) Ariadne Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-06-26.
External links
- shape model deduced from lightcurve
- bi-lobed shape model from Hubble lightcurves
- Orbital simulation from JPL (Java) / Ephemeris
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