Minor Planet Radar Database
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4769 Castalia (1989 PB)
Classification: APO [NEO, PHA]
H:16.9 mag, G:0.15
Wavefront file Reference: 1994Sci...263..940H

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1989 Aug Arecibo Arecibo 2380 [A]
1989 Aug Goldstone Goldstone 8495 [G]
2012 Sep Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N
morphological type
spectrum-based or image-based dimensions
maximum range extent Rmax km
minimum range extent Rmin km
maximum Doppler bandwidth Bmax Hz
minimum Doppler bandwidth Bmin Hz
effective diameter Deff km
quality code for size Q
shape-based dimensions
equivalent diameter Dequ km
extent along principal axis x Ex km
extent along principal axis y Ey km
extent along principal axis z Ez km
DEEVE extent along x Dx km
DEEVE extent along y Dy km
DEEVE extent along z Dz km
surface area A km2
volume V km3
spin
spin period Pspin h
spin rate ω deg/day
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ deg
spin axis ecliptic latitude β deg
reflectivity
radar cross-section OC σOC km2
radar cross-section SC σSC km2
radar cross-section σT km2
projected area Aproj km2
radar albedo OC σ̂OC
radar albedo SC σ̂SC
radar albedo σ̂T
circular polarization ratio μC 0.3 0.02 2008Icar..198..294B Date: 1989T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO384796 (heliocentric ecliptic J2000)
Element Value Units
e 0.4832835
a 1.0631647 AU
i 8.88435 deg
om 325.55413 deg
w 121.3803 deg
ma 325.96473 deg
n 0.89909019 deg/d

Link to complete orbital information at Minor Planet Center

Earth Close-Approach Data (+/- 10 years)
date nominal distance RTT SNR/run at Arecibo
2011-08-06 15:34:00 0.46341 462.5 0.5
2012-08-28 17:07:00 0.11351 113.3 62.4
2013-12-02 09:58:00 0.44218 441.3 0.5
2015-02-08 06:42:00 0.35822 357.5 1.1
2015-04-27 11:22:00 0.40422 403.4 0.7
2016-04-14 20:28:00 0.22333 222.9 5.9
2023-08-22 09:21:00 0.11003 109.8 69.5
2024-08-01 19:27:00 0.41134 410.5 0.7
2024-11-05 04:08:00 0.40210 401.3 0.8
2026-01-11 00:07:00 0.42296 422.1 0.6
2027-04-04 03:42:00 0.12883 128.6 40.1

Link to complete Close-Approach Data on SBDB at JPL