16974 Iphthime
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16974 Iphthime (/ɪfˈθaɪmiː/; provisional designation 1998 WR21) is a Jupiter trojan and a binary system from the Greek camp, approximately 57 kilometers (35 miles) in diameter. It was discovered on 18 November 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the ETS Test Site in Socorro, New Mexico.[1] The dark Jovian asteroid belongs to the 80 largest Jupiter trojans and has a notably slow rotation of 78.9 hours.[10] It was named after Iphthime from Greek mythology.[1] The discovery of its companion by Hubble Space Telescope was announced in March 2016.
Quick Facts Discovery, Discovered by ...
Discovery[1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 18 November 1998 |
Designations | |
(16974) Iphthime | |
Pronunciation | /ɪfˈθaɪmiː/[2] |
Named after | Iphthime Iphthīmē/Ἰφθῑμη[1] (Greek mythology) |
1998 WR21 · 1974 WX 1986 WS | |
Jupiter trojan[1][3] Greek[4] · background[5] | |
Adjectives | Iphthimean |
Orbital characteristics[3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 42.86 yr (15,655 d) |
Aphelion | 5.5556 AU |
Perihelion | 4.8248 AU |
5.1902 AU | |
Eccentricity | 0.0704 |
11.82 yr (4,319 d) | |
261.74° | |
0° 5m 0.24s / day | |
Inclination | 15.036° |
241.56° | |
134.72° | |
Jupiter MOID | 0.0605 AU |
TJupiter | 2.9270 |
Physical characteristics | |
Mean diameter | 55.43±4.0 km[6] 57.15±3.85 km[7] 57.34±0.33 km[8] |
78.9±0.4 h[9] | |
0.065±0.010[8] 0.066±0.009[7] 0.0691±0.011[6] | |
C (assumed)[10] V–I = 0.960±0.035[10] | |
9.80[1][3][6][7][8] | |
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