asteroid From Wikipedia, the free encyclopedia
Juno, minor-planet designation 3 Juno in the Minor Planet Center catalogue seestem, wis the third asteroid tae be discovered an is ane o the larger main-belt asteroids, bein ane o the twa lairgest stany (S-type) asteroids, alang wi 15 Eunomia.
![]() Juno seen at fower wavelengths. A lairge crater appears dark at 934 nm. | |
Discovery | |
---|---|
Discovered bi | Karl Ludwig Harding |
Discovery date | September 1, 1804 |
Designations | |
Pronunciation | /ˈdʒuːnoʊ/ |
Named after | Juno (Laitin: Iūno) |
Alternative names | none |
Minor planet category | Main belt (Juno clump) |
Adjectives | Junonian /dʒuːˈnoʊniən/[1] |
Orbital chairactereestics[2] | |
Epoch November 30, 2008 (JD 2454800.5) | |
Aphelion | 3.356 AU (502.050 Gm) |
Perihelion | 1.988 AU (297.40 Gm) |
2.672 AU (399.725 Gm) | |
Eccentricity | 0.2559 |
Orbital period | 4.37 a (1595.4 d) |
Average orbital speed | 17.93 km/s |
Mean anomaly | 256.8° |
Inclination | 12.968° |
Longitude o ascendin node | 169.96° |
Argument o perihelion | 247.93° |
Proper orbital elements[3] | |
Proper semi-major axis | 2.6693661 AU |
Proper eccentricity | 0.2335060 |
Proper inclination | 13.2515192° |
Proper mean motion | 82.528181 deg / yr |
Proper orbital period | 4.36215 yr (1593.274 d) |
Precession o perihelion | 43.635655 arcsec / yr |
Precession of the ascending node | −61.222138 arcsec / yr |
Pheesical chairacteristics | |
Dimensions | (320×267×200)±6 km[4] (233 km)[2] |
Mass | 2.67 ×1019 kg[4] |
Mean density | 2.98 ± 0.55 g/cm³[4] |
Surface gravity | 0.12 m/s² |
Escape velocity | 0.18 km/s |
7.21 hr[2] (0.3004 d)[5] | |
Albedo | 0.238 (geometric)[2][6] |
Temperatur | ~163 K max: 301 K (+28°C)[7] |
Spectral teep | S-type asteroid[2][8] |
Apparent magnitude | 7.4[9][10] to 11.55 |
5.33[2][6] | |
Angular diameter | 0.30" tae 0.07" |
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