এরিস
উইকিপিডিয়া, মুক্ত বিশ্বকোষ থেকে
2003 UB313
(center) and moon (right of center). |
|
| Discovery A | |
|---|---|
| Discoverer | M. E. Brown, C. A. Trujillo, D. L. Rabinowitz |
| Discovery date | October 21, 2003 |
| Alternate designations B |
officially none; informally Xena |
| Category | Trans-Neptunian object (Scattered disc object) |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.44177 |
| Semi-major axis (a) | 67.6681 AU (10.12 Tm) |
| Perihelion (q) | 37.77 AU (5.65 Tm) |
| Aphelion (Q) | 97.56 AU (14.60 Tm) |
| Orbital period (P) | 203,500 d (557 a) |
| Mean orbital speed | 3.436 km/s |
| Inclination (i) | 44.187° |
| Longitude of the ascending node (Ω) |
35.8696° |
| Argument of perihelion (ω) |
151.4305° |
| Mean anomaly (M) | 197.63427° |
| Physical characteristics D | |
| Dimensions | 2400 km ± 100 km |
| Mass | ?×10? kg |
| Density | ? g/cm³ |
| Surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | > 8 h? |
| Spectral class | ? |
| Absolute magnitude | −1.12 ± 0.01 |
| Albedo (geometric) | 0.86 ± 0.07 |
| Mean surface temperature |
~30 K |
২০০৩ ইউবি৩১৩ একটি বামন গ্রহ
