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757 Portlandia

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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
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]

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

References

  1. ^ a b c d e "JPL Small-Body Database Browser: 493 Griseldis (1902 JS)". Jet Propulsion Laboratory. Retrieved 5 May 2016.
  2. ^ https://www.facebook.com/photo.php?fbid=10206800415562318


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