19P/Borrelly

Comet Borrelly /bɒˈrɛli/ or Borrelly's Comet (official designation: 19P/Borrelly) is a periodic comet, which was visited by the spacecraft Deep Space 1 in 2001. The comet last came to perihelion (closest approach to the Sun) on February 1, 2022 and will next come to perihelion on December 11, 2028.

19P/Borrelly closest Earth approach on 2028-Dec-05
Date & time of
closest approach		 Earth distance
(AU)		 Sun distance
(AU)		 Velocity
wrt Earth
(km/s)		 Velocity
wrt Sun
(km/s)		 Uncertainty
region
(3-sigma)		 Reference
2028-Dec-05 19:12 ± 6 min0.413 AU (61.8 million km; 38.4 million mi; 161 LD)1.31 AU (196 million km; 122 million mi; 510 LD)17.333.3± 41 thousand kmHorizons
19P/Borrelly
Discovery
Discovered byAlphonse Borrelly
Discovery dateDecember 28, 1904
Designations
Alternative names
1905 II; 1911 VIII; 1918 IV;
1925 VIII; 1932 IV; 1953 IV;
1960 V; 1967 VIII; 1974 VII;
1981 IV; 1987 XXXIII; 1994 XXX
Orbital characteristics
Epoch 2022-08-09 (JD 2459800.5)
Aphelion5.90 AU
Perihelion1.306 AU
Semi-major axis
3.61 AU
Eccentricity0.6377
Orbital period (sidereal)
6.85 yr
Inclination29.30°
2028-Dec-11
February 1, 2022 (last)
Earth MOID0.36 AU (54 million km)
Physical characteristics
Dimensions8×4×4 km
Mean radius
2.4 km
Mass2×1013 kg
Mean density
0.3 g/cm3
Albedo0.03
    Perihelion distance
    at recent epochs
    EpochPerihelion
    (AU)
    20281.310
    20221.306
    20151.349
    20081.355

    Deep Space 1 returned images of the comet's nucleus from 3400 kilometers away. At 45 meters per pixel, it was the highest resolution view ever seen of a comet.

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