(225416) 1999 YC
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 17 December 1999[1][2] |
| Designations | |
Designation | (225416) 1999 YC |
| 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] | |
(225416) 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]
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
[edit]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
[edit]1999 YC is a C-type asteroid.[3]
Measurements from WISE have measured the asteroid's albedo to be between 0.067 and 0.121, corresponding to a size of between 1.5 and 1.8 kilometers.[1]
Formation
[edit]Like most asteroids, it is believed to have formed from the primordial solar nebula as fragments of planetesimals—material in the early Solar System that was not massive enough to become a planet.[7]
See also
[edit]- (155140) 2005 UD, another fragment of 3200 Phaethon
- Geminids
References
[edit]- 1 2 3 4 5 6 7 8 9 10 "JPL Small-Body Database Browser: 225416 (1999 YC)" (2025-02-02 last obs.). Jet Propulsion Laboratory. 4 March 2025. Retrieved 29 January 2026.
- 1 2 3 4 "(225416) = 1999 YC". Minor Planet Center. International Astronomical Union. Retrieved 29 January 2026.
- 1 2 3 Kasuga, Toshihiro; Jewitt, David (18 May 2008). "Observations of 1999 YC and the Breakup of the Geminid Stream Parent". The Astronomical Journal. 136 (2): 881–889. arXiv:0805.2636. Bibcode:2008AJ....136..881K. doi:10.1088/0004-6256/136/2/881.
- ↑ Cukier, Wolf Z.; Szalay, Jamey R. (19 June 2023). "Formation, Structure, and Detectability of the Geminids Meteoroid Stream". The Planetary Science Journal. 4 (6): 109. arXiv:2306.11151. Bibcode:2023PSJ.....4..109C. doi:10.3847/PSJ/acd538.
- ↑ Ryabova, G O; Avdyushev, V A; Williams, I P (21 May 2019). "Asteroid (3200) Phaethon and the Geminid meteoroid stream complex". Monthly Notices of the Royal Astronomical Society. 485 (3): 3378–3385. doi:10.1093/mnras/stz658. ISSN 0035-8711.
- ↑ "(225416) = 1999 YC". Minor Planet Center. International Astronomical Union. Retrieved 29 January 2026.
- ↑ "What Are Asteroids And Comets?". Near Earth Object Program FAQ. NASA. Archived from the original on 9 September 2010. Retrieved 13 September 2010.
External links
[edit]- List of Apollo asteroids – International Astronomical Union Minor Planet Center.
- (225416) 1999 YC at the JPL Small-Body Database
- (225416) 1999 YC at NeoDyS-2, Near Earth Objects—Dynamic Site
- (225416) 1999 YC at ESA–space situational awareness
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