225 Henrietta
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | April 19, 1882 |
| Designations | |
| n/a | |
| Main belt (Cybele) | |
| Orbital characteristics | |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 641.471 Gm (4.288 AU) |
| Perihelion | 370.46 Gm (2.476 AU) |
| 505.966 Gm (3.382 AU) | |
| Eccentricity | 0.268 |
| 2271.87 d (6.22 a) | |
|
Average orbital speed
|
16.2 km/s |
| 215.046° | |
| Inclination | 20.902° |
| 197.199° | |
| 104.697° | |
| Physical characteristics | |
| Dimensions | 121.0 km |
| 7.356 h | |
| Albedo | .040 |
|
Spectral type
|
C |
| 8.72 | |
225 Henrietta is a very large outer main-belt asteroid. It was discovered by Johann Palisa on April 19, 1882, in Vienna and named after Henrietta, wife of astronomer Pierre J. C. Janssen.
This is classified as a C-type asteroid and is probably composed of privitive carbonaceous material. It has very dark surface, with an albedo of 0.040. Photometric measurements made from the Oakley Southern Sky Observatory during 2012 gave a light curve with a period of 7.352 ± 0.003 hours and a variation in brightness of 0.18 ± 0.02 in magnitude. This is consistent with a synodic rotation period of 7.356 ± 0.001 hours determined in 2000.[1]
In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.58 AU. The resulting data yielded an effective diameter of 128 ± 16 km.[2]
225 Henrietta belongs to Cybele group of asteroids and is probably in a 4:7 orbital resonance with the planet Jupiter.
References
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Lightcurve Data File
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