4034 Vishnu

4034 Vishnu^[1]

Discovery
Discovered by	Eleanor F. Helin
Discovery site	Palomar
Discovery date	2 August 1986
Designations
Minor planet category	PHA[1]
Orbital characteristics[1]
Epoch 26 January 2011 (JD 2455587.5)
Uncertainty parameter 0
Observation arc	10565 days (28.93 yr)
Aphelion	1.5300 AU (228.88 Gm)
Perihelion	0.58927 AU (88.154 Gm)
Semi-major axis	1.0597 AU (158.53 Gm)
Eccentricity	0.44391
Orbital period	1.09 yr (398.42 d)
Mean anomaly	50.8081°
Mean motion	0° 54^m 12.816^s / day
Inclination	11.170°
Longitude of ascending node	158.004°
Argument of perihelion	296.580°
Earth MOID	0.0192758 AU (2.88362 Gm)
Jupiter MOID	3.68865 AU (551.814 Gm)
Jupiter Tisserand parameter	5.704
Physical characteristics
Dimensions	0.4 km[1]
Mean radius	0.21 km
Geometric albedo	0.52[1]
Absolute magnitude (H)	18.4[1]

4034 Vishnu (provisional designation: 1986 PA) is an Apollo asteroid, 0.4 kilometers in diameter.^[1] It completes one revolution around the Sun almost once every year. It was discovered by Eleanor F. Helin at the Palomar Observatory in San Diego County, California on August 2, 1986. It is an O-type asteroid,^[1] meaning it is similar to the asteroid 3628 Boznemcová, which is the best asteroid match to the spectra of L6 and LL6 ordinary chondrite meteorites. L and LL chondrites have lower iron and metal content, but higher iron oxide content in the silicates.

Its highly eccentric orbit crosses the orbits of Venus, Earth, and Mars. From 1800 to 2200 the asteroid passes within 30 Gm of Venus 71 times, Earth 29 times, and Mars 7 times.

It has been observed by radar astronomy and the orbital solution includes non-gravitational forces.^[1]

References

1. "JPL Small-Body Database Browser: 4034 Vishnu (1986 PA)". Retrieved 14 April 2016.

External links

• 4034 Vishnu at the JPL Small-Body Database

• Discovery · Orbit diagram · Orbital elements · Physical parameters