Asteroid Radar Database
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4034 Vishnu (1986 PA)
Classification: APO [NEO, PHA]
H:18.41 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1989 Mar Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
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 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
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 0.21 0.14 2008Icar..198..294B Date: 1989T

Orbital Elements at Epoch 2022-01-21 00:00 TT from MPO647060 (heliocentric ecliptic J2000)
Element Value Units
e 0.4440016
a 1.0595342 AU
i 11.16865 deg
om 157.90545 deg
w 296.71711 deg
ma 76.70984 deg
n 0.90371524 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
2014-05-03 03:35:00 0.48587 484.9 0.2
2021-08-28 01:44:00 0.22074 220.3 3.3
2022-08-24 14:54:00 0.31434 313.7 1.0
2022-10-25 19:57:00 0.33379 333.1 0.8
2024-01-10 13:57:00 0.40378 403.0 0.4
2025-04-01 10:03:00 0.15676 156.4 11.0
2026-05-02 19:32:00 0.47742 476.5 0.2
2033-08-26 18:13:00 0.25189 251.4 2.1

Link to complete Close-Approach Data on SBDB at JPL