3 Juno

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.

3 Juno

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)
Semi-major axis	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
Rotation period	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
Absolute magnitude (H)	5.33[2][6]
Angular diameter	0.30" tae 0.07"