Minor Planet Radar Database
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37655 Illapa (1994 PM)
Classification: APO [NEO, PHA]
H:17.9 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2003 Aug Goldstone Goldstone 8560 [G]
2012 Aug 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 0.2 0.04 2008Icar..198..294B Date: 2003T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO452694 (heliocentric ecliptic J2000)
Element Value Units
e 0.7526515
a 1.4778446 AU
i 18.01655 deg
om 139.5887 deg
w 303.82733 deg
ma 237.75225 deg
n 0.54860644 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
2012-08-12 07:54:00 0.09515 95.0 48.3
2018-03-30 05:28:00 0.28288 282.3 1.1
2021-08-08 07:47:00 0.19104 190.7 4.3
2027-03-22 09:34:00 0.33163 331.0 0.6

Link to complete Close-Approach Data on SBDB at JPL