757 Portlandia
| Discovery | |
|---|---|
| Discovered by | Joel Hastings Metcalf |
| Discovery site | Taunton, Massachusetts |
| Discovery date | 30 September 1908 |
| Designations | |
| 1908 EJ | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 99.16 yr (36218 d) |
| Aphelion | 2.6327 AU (393.85 Gm) |
| Perihelion | 2.1142 AU (316.28 Gm) |
| 2.3734 AU (355.06 Gm) | |
| Eccentricity | 0.10922 |
| 3.66 yr (1335.6 d) | |
| 133.453° | |
| 0° 16m 10.38s / day | |
| Inclination | 8.1694° |
| 22.515° | |
| 44.204° | |
| Earth MOID | 1.13364 AU (169.590 Gm) |
| Jupiter MOID | 2.65433 AU (397.082 Gm) |
| Jupiter Tisserand parameter | 3.521 |
| 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] | |
|
| |
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 2 3 4 5 "JPL Small-Body Database Browser: 493 Griseldis (1902 JS)". Jet Propulsion Laboratory. Retrieved 5 May 2016.
- ↑ https://www.facebook.com/photo.php?fbid=10206800415562318
External links
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