introduction
 | |
| Orbital Properties | |
|---|---|
| Large semi-axis | 522.135×106km (3,490 AU) |
| aphelia | 563,729×106km (3,768 AU) |
| perihelion | 480,540×106km (3,212 AU) |
| eccentricity | 0.080 |
| period of revolution | 2,381.639 days (6.521a) |
| Average circulation speed | 15.92km/s |
| Tilt | 10,856 degrees |
| ascending node | 73,330 degrees |
| perihelion argument | 266.048 degrees |
| Average anomaly | 53.356° |
| category | asteroid belt (cybele) |
| Physical Properties | |
| Dimensions | 384×264×232km |
| Dimensions | 1,478×1019kg |
| volumetric mass | 1200kg/m3 |
| Equatorial Surface Gravity (A surface usually refers to the superficial layer of an object. The term a…) | 0.048m/s2 |
| release speed | 0.12km/s |
| rotation period | 0.2160d (5,184 hrs) |
| Spectral Classification | X (Bus & Binzel, 2002) |
| Absolute greatness | 6.94 |
| albedo | 0.043 |
| temperature | ~151,000 |
| discovery | |
| explorer | Norman Robert Pogson |
| Date | May 16, 1866 |
| Designation(s) | A909GA |
(87) Sylvia is one of the largest asteroids in the main belt and the first discovered asteroid with a system of two asteroid moons as natural satellites.
It was discovered by Norman Robert Pogson on May 16, 1866.
Physical Properties
(87) Sylvia is very dark in color (color is the eye’s subjective perception of one or more wave frequencies…) and probably has a primary composition. The discovery of its satellites allowed very accurate measurements of its mass and its density (The density or specific gravity of a body is the ratio of its density to…), which is also extremely low, indicating that the asteroid is very porous. Its volume (Volume, in the physical or mathematical sciences, is a quantity that measures expansion…) must be approximately 60% vacuum (Vacuum is usually defined as the absence of matter in a spatial zone).
Its rotation speed (We distinguish:) in itself is very fast and is of the order of 5.18 hours (The hour is a unit of measurement:) (its other physical characteristics are listed in the table (The table may vary depending on the context used 🙂 across from).
satellites
(87) Sylvia is the first known asteroid to have at least two natural satellites. These were probably caused by a collision (A collision is a direct collision between two objects. Such an impact transmits part of…) and it is possible that there are other satellites nearby (Rund is the name given to the bird nomenclature used in French). (Update) returns…) of (87) Sylvia, too small to be recognized at this time.
(87) Sylvia I Romulus
Romulus, the first satellite (satellite may refer to:), (tentative name: S/2001 (87) 1), was observed on February 18, 2001 by Michael E. Brown and Jean-Luc Margot using the telescope (A telescope , (from the Greek tele means “far” and skopein means…) Keck II of the Mauna Kea Observatory in Hawaii
It measures approximately 18 ± 4 km in diameter (In a circle or sphere, diameter is a straight segment passing through the center…), orbit (In celestial mechanics, an orbit is the trajectory traced by a body in space .. .) at a distance of 1,356 ± 5 km from (87) Sylvia and completes one complete revolution in 3.6496 ± 0.0007 days (The day or day is the interval between sunrise and sunset of the Sun; it is the . ..) (87.59 hours ).
(87) Sylvia II. Remus
Remus, the second satellite (satellite may refer to:), (tentative name: S/2004 (87) 1), was acquired on August 9, 2005 by Franck Marchis (of the University of California (The University of California is an American ) discovered University, founded in 1868, including…) in Berkeley) and Pascal Descamps, Daniel Hestroffer and Jérome Berthier (of the Paris Observatory), thanks to one of the 4 telescopes of 8.2 meters (The meter (symbol m, from which Greek metron, measure) is the basic unit of length of the…) Very Large Telescope (The Very Large Telescope (VLT) is a set of 4 main telescopes and 4 auxiliary telescopes…) (VLT) of the European Southern Observatory ( The European Southern Observatory (ESO ) is a…) (ESO)
It is about 7 ± 2 km in diameter, orbits 706 ± 5 km from the primary axis, and completes one complete revolution in 1.3788 ± 0.000733 days (33.09 hours).