Arecibo radar image showing Castalia as a contact binary
Discovery[1]
Discovered by
E. F. Helin Palomar Observatory (675)
Discovery date
9 August 1989
Designations
MPC designation
(4769) Castalia
Pronunciation
/kæˈsteɪliə/[2]
Named after
Castalia
Alternative designations
1989 PB
Minor planet category
Apollo
NEO
PHA[1]
Venus-crosser asteroid
Mars-crosser asteroid
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)
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° 53m 56.256s / day
Inclination
8.8863°
Longitude of ascending node
325.59°
Argument of perihelion
121.35°
Known satellites
1 contact binary
Earth MOID
0.0199 AU (7.7 LD)[1]
Physical characteristics
Mean diameter
1.4 km[1]
1.8×0.8 km
Synodic rotation period
4.095 h (0.1706 d)[1]
Absolute magnitude (H)
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]
^ abcdefghCite error: The named reference jpldata was invoked but never defined (see the help page).
^"Castalia". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
4769Castalia (/kəˈsteɪliə/; prov. designation: 1989 PB) is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately...
and to nurture and play the Glass Bead Game. Castalian Spring Castalia House 4769Castalia, an Earth-crossing asteroid 646 Kastalia, an asteroid The spring...
observatory directly imaged an asteroid for the first time in history: 4769Castalia. The following year, Polish astronomer Aleksander Wolszczan made the...
Observatory, Australia List 6489 Golevka 1991 Eleanor F. Helin List 4769Castalia 1989 Eleanor F. Helin List 4660 Nereus 1982 Eleanor F. Helin List 4581...
in 1984. The Voyager 2 spacecraft provided images of them in 1989. 4769Castalia was discovered in 1989. It became the first asteroid to be viewed through...
August 9 Toshiki Kaifu becomes Prime Minister of Japan. The asteroid 4769Castalia is the first directly imaged by radar from Arecibo Observatory. The...
4×1.9 January 4, 1989 Closely approached Earth on September 29, 2004 4769Castalia 1.8×0.8 August 9, 1989 First asteroid to be radar-imaged in sufficient...
orbiting the Sun, not to be confused with the near-Earth asteroid 4769Castalia. 'Castalia' in Noah Webster (1884) A Practical Dictionary of the English Language...
involved many significant events, some listed below. August – Asteroid 4769Castalia is the first asteroid directly imaged, by radar from Arecibo. August...
attraction. They typically show a bifurcated, dumbbell-like shape (also see 4769Castalia). A large number of near-Earth objects are believed to be contact-binaries...
gravitational attraction, and typically show a dumbbell-like shape (also see 4769Castalia). A large number of near-Earth objects are thought to be contact binaries...
Global Information