757 Portlandia

757 Portlandia is a main-belt asteroid 32 km in diameter.[1] In November 2015, amateur astronomers captured it with images of comet 67P/Churyumov–Gerasimenko.[2] Portlandia came to opposition in March 2016 at apparent magnitude 13.2.

757 Portlandia
Discovery
Discovered byJoel Hastings Metcalf
Discovery siteTaunton, Massachusetts
Discovery date30 September 1908
Designations
(757) Portlandia
1908 EJ
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc99.16 yr (36218 d)
Aphelion2.6327 AU (393.85 Gm)
Perihelion2.1142 AU (316.28 Gm)
2.3734 AU (355.06 Gm)
Eccentricity0.10922
3.66 yr (1335.6 d)
133.453°
0° 16m 10.38s / day
Inclination8.1694°
22.515°
44.204°
Physical characteristics
Mean radius
16.045±0.7 km
6.5837 h (0.27432 d)[1]
0.1427±0.014[1]
M
12.3 to 15.7
10.20[1]

    References


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