 | |
| Discovery[1] | |
|---|---|
| Discovered by | E. F. Helin Palomar Observatory (675) |
| Discovery date | 9 August 1989 |
| Designations | |
| (4769) Castalia | |
| Pronunciation | /kæˈsteɪliə/[2] |
Named after | Castalia |
| 1989 PB | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 9467 days (25.92 yr) |
| Aphelion | 1.5770 AU (235.92 Gm) |
| Perihelion | 0.54957 AU (82.215 Gm) |
| 1.0633 AU (159.07 Gm) | |
| Eccentricity | 0.48313 (e) |
| 1.10 yr (400.46 d) | |
| 327.23° | |
| 0° 53m 56.256s / day | |
| Inclination | 8.8863° |
| 325.59° | |
| 121.35° | |
| Known satellites | 1 contact binary |
| Earth MOID | 0.0199 AU (7.7 LD)[1] |
| Physical characteristics | |
| |
| 4.095 h (0.1706 d)[1] | |
| 16.9[1] | |
4769 Castalia (/kəˈsteɪliə/; prov. designation: 1989 PB) is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.4 kilometers (0.87 miles) in diameter and was the first asteroid to be modeled by radar imaging. It was discovered on 9 August 1989, by American astronomer Eleanor Helin (Caltech) on photographic plates taken at Palomar Observatory in California. It is named after Castalia, a nymph in Greek mythology. It is also a Mars- and Venus-crosser asteroid.[1]
- ^ a b c d e f g h Cite error: The named reference
jpldatawas invoked but never defined (see the help page). - ^ "Castalia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)