(225416) 1999 YC
Near-Earth Asteroid
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(225416) 1999 YC (provisional designation 1999 YC) is a large near-Earth asteroid of the Apollo group. The asteroid was discovered by astronomers at the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory Experimental Test Site. [2]
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 17 December 1999[1][2] |
| Designations | |
Designation | (225416) 1999 YC |
| 1999 YC[1] | |
| Orbital characteristics[1] | |
| Epoch 21 November 2025 (JD 2461000.5) | |
| Uncertainty parameter 0[2] | |
| Observation arc | 9,199 d (25.19 yr) |
| Aphelion | 2.6022 AU |
| Perihelion | 0.2414 AU |
| 1.4218 AU | |
| Eccentricity | 0.8302 |
| 619 d (1.69 yr) | |
| 70.92° | |
| 0° 34m 52.68s / day | |
| Inclination | 38.263° |
| 64.75° | |
| 156.45° | |
| Earth MOID | 0.24851 AU |
| Physical characteristics | |
| 1.651 ± 0.175 km[1] | |
| 4.531 h [1] 4.4950 ± 0.0010 h[3] | |
| Albedo | 0.094 ± 0.027[1] |
Spectral type | C[3] |
| 17.36[1][2] | |
1999 YC has been suggested to be a fragment of 3200 Phaethon. [4] The asteroid does not appear to be a member of the Phaethon-Geminid complex.[5]
Orbit and classification
1999 YC orbits the sun on a highly eccentric orbit at a distance between 0.24 AU and 2.60 AU, about every 1.7 years.[1] Its perihelion is within the orbit of Mercury, making the asteroid a Mercury-crosser. The asteroid is an Apollo asteroid, which means its perihelion is within Earth's orbit and has a semi-major axis larger than 1 AU. Despite 1999 YC's large size, the asteroid is not considered to be a potentially hazardous object due to its minimum orbital intersection distance being 0.25 AU, greater than the 0.05 AU maximum needed.[1]
1999 YC's observation arc begins with a precovery taken at the Fred Lawrence Whipple Observatory on 27 November 1999, 20 days before the official discovery observation made by LINEAR.[6]
Physical characteristics
1999 YC is a C-type asteroid.[3]
Measurements from WISE have measured the asteroid's albedo to be between 0.067 to 0.121, corresponding to a size of between 1.5 to 1.8 kilometers.[1]
Formation
Like most asteroids, it is believed to have formed from the primordial solar nebula as fragments of planetesimalsâmaterial in the early Solar System that was not massive enough to become a planet.[7]
See also
- (155140) 2005 UD, another fragment of 3200 Phaethon
- Geminids
