Key facts
- Discovered by
- E. F. Helin , Palomar Observatory ( 675 )
- Discovery date
- 9 August 1989
- Pronunciation
- / k æ ˈ s t eɪ l i ə /
- Named after
- Castalia
- Alternative designations
- 1989 PB
- Minor planet category
- Apollo NEO PHA Venus-crosser asteroid Mars-crosser asteroid
- Observation arc
- 9467 days (25.92 yr)
- Aphelion
- 1.5770 AU (235.92 Gm )
- Perihelion
- 0.54957 AU (82.215 Gm)
- Semi major axis
- 1.0633 AU (159.07 Gm)
- Eccentricity
- 0.48313 (e)
- Orbital period sidereal
- 1.10 yr (400.46 d )
- Mean anomaly
- 327.23 °
- Mean motion
- 0° 53 56.256 / day
- Inclination
- 8.8863°
- Longitude of ascending node
- 325.59°
- Argument of perihelion
- 121.35°
- Known satellites
- 1 contact binary
via Wikipedia infobox
Wikidata facts
- Instance of
- near-Earth object
- Named after
- Castalia
- Followed by
- 4770 Lane
- Follows
- Q154631
- Parent body
- Sun
- Minor-planet group
- asteroid belt
- Diameter
- 1.4
- Orbital period
- 400.3646597722501
- Image
- Orbit 4769 Castalia.png
Show 18 more facts
- discoverer or inventor
- Eleanor F. Helin
- site of astronomical discovery
- Palomar Observatory
- provisional designation
- 1989 PB
- time of discovery or invention
- 1989-08-09
- absolute magnitude
- 17.4
- orbital inclination
- 8.885145229309328
- orbital eccentricity
- 0.4831979099070784
- apoapsis
- 1.576778333746403
- semi-major axis of an orbit
- 1.063093686428662
- mean anomaly
- 323.7707381103415
- longitude of ascending node
- 325.5023370975643
- argument of periapsis
- 121.452767517339
- periapsis
- 0.5494090391109215
- Commons category
- 4769 Castalia
- albedo
- 0.092
- rotation period
- 4.095
- time of periapsis
- 2461040.7914336394
- epoch
- November 21, 2025
Sources (3)
via Wikidata · CC0
~2 min read
Encyclopedic overview
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.
General information
Excerpted from Wikipedia’s “4769 Castalia” article, available under the CC BY-SA 4.0 licence.