Astronomy:525 Adelaide
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 21 October 1908 |
| Designations | |
| (525) Adelaide | |
| Pronunciation | /ˈædəleɪd/ |
| 1908 EKa; 1930 FX; 1937 JG; 1955 SE1; 1955 UF | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 107.13 yr (39129 d) |
| |{{{apsis}}}|helion}} | 2.4746 astronomical unit|AU (370.19 Gm) |
| |{{{apsis}}}|helion}} | 2.0157 AU (301.54 Gm) |
| 2.2452 AU (335.88 Gm) | |
| Eccentricity | 0.10218 |
| Orbital period | 3.36 yr (1228.8 d) |
| Mean anomaly | 311.640° |
| Mean motion | 0° 17m 34.728s / day |
| Inclination | 5.9953° |
| Longitude of ascending node | 203.410° |
| 264.252° | |
| Physical characteristics | |
| Rotation period | 19.967 h (0.8320 d) |
| Absolute magnitude (H) | 12.53 |
525 Adelaide is an S-type asteroid[2] belonging to the Flora family in the Main Belt. It was discovered 21 October 1908 by Joel Hastings Metcalf.
Previously, the object A904 EB, discovered 14 March 1904 by Max Wolf, had been named 525 Adelaide but was subsequently lost. When it was rediscovered 3 October 1930 by Sylvain Arend as 1930 TA, it was named 1171 Rusthawelia. Some 28 years passed before the two objects were realized to be the same. 1930 TA retained the name Rusthawelia (and discovery credited to Arend); the name 525 Adelaide was reused for the object 1908 EKa.
Another confusion occurred in 1929, one year before Arend's discovery, when American astronomer Anne Sewell Young thought to have found long-lost "Adelaide", when in fact she mistook the asteroid for comet 31P/Schwassmann–Wachmann that had a very similar orbital eccentricity.[3]
This object is orbiting the Sun at a distance of 2.245 astronomical unit|AU with a moderate eccentricity (ovalness) of 0.10 and an orbital period of 3.36 years. The orbital plane is inclined at an angle of 6.0° relative to the plane of the ecliptic. Based on infrared observations, 525 Adelaide has a diameter of 9.326±0.239 km. It is spinning on its axis with a rotation period of 19.967 hours. The spectral classification of this asteroid is SU.[1]
References
- ↑ 1.0 1.1 "525 Adelaide (1908 EKa)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=20000525.
- ↑ [1]
- ↑ "Long 'Lost' Planet Found Masquerading as Comet". Oakland Tribune: p. 31. June 21, 1929. https://www.newspapers.com/clip/14987519/anne_sewell_young_18711961/.
External links
- 525 Adelaide at AstDyS-2, Asteroids—Dynamic Site
- 525 Adelaide at the JPL Small-Body Database
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