325 Heidelberga
Heidelberga (minor planet designation: 325 Heidelberga) is a large main belt asteroid that was discovered by German astronomer Max Wolf on 4 March 1892 in Heidelberg. It is orbiting the Sun at a distance of 3.21 AU with an eccentricity (oval shape) of 0.159. The orbital plane is inclined at an angle of 8.55° to the ecliptic.[1]
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery date | 4 March 1892 |
| Designations | |
| (325) Heidelberga | |
| Pronunciation | /ˌhaɪdəlˈbɜːrɡə/ |
Named after | Heidelberg |
| Main belt | |
| Adjectives | Heidelergian /ˌhaɪdəlˈbɜːrdʒiən, -ɡiən/ |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 117.86 yr (43050 d) |
| Aphelion | 3.7223 AU (556.85 Gm) |
| Perihelion | 2.69998 AU (403.911 Gm) |
| 3.21115 AU (480.381 Gm) | |
| Eccentricity | 0.15919 |
| 5.75 yr (2101.8 d) | |
| 7.2090° | |
| 0° 10m 16.608s / day | |
| Inclination | 8.5545° |
| 344.881° | |
| 68.563° | |
| Physical characteristics | |
| Dimensions | 75.72±1.7 km |
| 6.737 h (0.2807 d) | |
| 0.1068±0.005 | |
| 8.65 | |
Based upon its spectrum, 325 Heidelberga is classified as an M-type asteroid. No absorption features have been detected with certainty, indicating it most likely has a nickel-iron or enstatite chondrite composition.[2] A weak feature in the near infrared spectrum indicates the presence of low-iron orthopyroxene on the asteroid surface.[3]
References
- Yeomans, Donald K., "325 Heidelberga", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 11 May 2016.
- Hardersen, Paul S.; Gaffey, Michael J.; Abell, Paul A. (January 1983), "Near-IR spectral evidence for the presence of iron-poor orthopyroxenes on the surfaces of six M-type asteroids", Icarus, vol. 175, no. 1, pp. 141–158, Bibcode:2005Icar..175..141H, doi:10.1016/j.icarus.2004.10.017.
- Takir, D.; Hardersen, P. S.; Gaffey, M. J. (March 2008), "The Near-Infrared Spectroscopy of Two M-Class Main Belt Asteroids, 77 Frigga and 325 Heidelberga", 39th Lunar and Planetary Science Conference, (Lunar and Planetary Science XXXIX), held March 10-14, 2008 in League City, Texas. LPI Contribution No. 1391, p. 1084, Bibcode:2008LPI....39.1084T
External links
- 325 Heidelberga at AstDyS-2, Asteroids—Dynamic Site
- 325 Heidelberga at the JPL Small-Body Database
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