 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 17 October 1879 |
| Designations | |
| MPC designation | (207) Hedda |
| Pronunciation | German: [ˈhɛdaː] |
| Named after | Hedwig Winnecke |
| Alternative designations | A879 UA, 1932 CL1 1934 XJ, 1953 BF |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 133.61 yr (48801 d) |
| Aphelion | 2.3497 AU (351.51 Gm) |
| Perihelion | 2.2177 AU (331.76 Gm) |
| Semi-major axis | 2.2837 AU (341.64 Gm) |
| Eccentricity | 0.028894 |
| Orbital period (sidereal) | 3.45 yr (1260.5 d) |
| Average orbital speed | 19.71 km/s |
| Mean anomaly | 34.9926° |
| Mean motion | 0° 17 8.124 / day |
| Inclination | 3.8036° |
| Longitude of ascending node | 29.212° |
| Time of perihelion | 2023-Feb-21 |
| Argument of perihelion | 192.936° |
| Physical characteristics | |
| Dimensions | 58.70±1.3 km |
| Synodic rotation period | 30.098 h (1.2541 d) 19.489 h |
| Geometric albedo | 0.0552±0.003 |
| Spectral type | C |
| Absolute magnitude (H) | 9.92 |
207 Hedda is a sizeable Main belt asteroid. It is a C-type asteroid, meaning it is primitive in composition and dark in colour. This asteroid was discovered by Johann Palisa on October 17, 1879, in Pola and was named after Hedwig Winnecke (née Dell), wife of astronomer Friedrich A. T. Winnecke.
Attempts to determine the rotation period for this asteroid have led to conflicting results. A study published in 2010 using photometric observations from Organ Mesa Observatory showed a rotation period of 19.489 ± 0.002 hours and a brightness variation of 0.18 ± 0.02 in magnitude.
References
- ^ "207 Hedda". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
- ^ Pilcher, Frederick (January 2010), "Rotational Period Determination for 23 Thalia, 204 Kallisto and 207 Hedda, and Notes on 161 Athor and 215 Oenone", The Minor Planet Bulletin, 37 (1): 21–23, Bibcode:2010MPBu...37...21P.
- Schmadel, L. (2003:31). Dictionary of minor planet names. Germany: Springer.
External links
- The Asteroid Orbital Elements Database
- Asteroid Albedo Compilation
- 207 Hedda at AstDyS-2, Asteroids—Dynamic Site
- 207 Hedda at the JPL Small-Body Database
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