(154276) 2002 SY50
Asteroid
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(154276) 2002 SY50, provisional designation 2002 SY50, is a stony asteroid on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.1 kilometers (0.7 miles) in diameter. It was discovered on 30 September 2002, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States.[1] The K-type asteroid has a rotation period of 4.8 hours.[3][a] It will make a close encounter with Earth on 30 October 2071.[6]
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab's ETS |
| Discovery date | 30 September 2002 |
| Designations | |
| (154276) 2002 SY50 | |
| 2002 SY50 | |
| Apollo · NEO · PHA[1][2] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 11.78 yr (4,304 d) |
| Aphelion | 2.8793 AU |
| Perihelion | 0.5297 AU |
| 1.7045 AU | |
| Eccentricity | 0.6892 |
| 2.23 yr (813 d) | |
| 305.15° | |
| 0° 26m 34.44s / day | |
| Inclination | 8.7443° |
| 34.298° | |
| 99.395° | |
| Earth MOID | 0.0027 AU (1.0519 LD) |
| Physical characteristics | |
| 0.897 km (calculated)[3] 1.060±0.346 km[4] | |
| 4.823 h[a] | |
| 0.143±0.173[4] 0.20 (assumed)[3] | |
| K[5] · S (assumed)[3] | |
| 17.00[5] 17.6[2][3][4] | |
Orbit and classification
2002 SY50 is a member of the Earth-crossing group of Apollo asteroids, the largest group of near-Earth objects with approximately 10 thousand known members.[1][2]
It orbits the Sun at a distance of 0.53â2.88 AU once every 2 years and 3 months (813 days; semi-major axis of 1.7 AU). Its orbit has an eccentricity of 0.69 and an inclination of 9° with respect to the ecliptic.[2] Due to its large aphelion of 2.88 AU, it also crosses the orbit of Mars at 1.66 AU.[2] The body's observation arc begins one month prior to its official discovery observation with its first observation by the NEAT program at Palomar Observatory in August 2002.[1]
Close approaches
The asteroid has an Earth minimum orbital intersection distance of 0.0027 AU (404,000 km; 251,000 mi), which corresponds to 1.05 lunar distances and makes it a potentially hazardous asteroid due to its sufficiently large size.[2]
In November 1933, it approached Earth at a nominal distance of 0.098 AU (38 LD), and in November 2002 at 0.084 AU (33 LD). Its closest near-Earth encounter is predicted to occur on 30 October 2071, at a distance of 0.0088 AU (3.4 LD) only (see table).[6]
| PHA | Date | Approach distance (lunar dist.) | Abs. mag (H) |
Diameterâ(C) (m) |
Refâ(D) | ||
|---|---|---|---|---|---|---|---|
| Nomi- nal(B) |
Mini- mum |
Maxi- mum | |||||
| (33342) 1998 WT24 | 1908-12-16 | 3.542 | 3.537 | 3.547 | 17.9 | 556â1795 | data |
| (458732) 2011 MD5 | 1918-09-17 | 0.911 | 0.909 | 0.913 | 17.9 | 556â1795 | data |
| (7482) 1994 PC1 | 1933-01-17 | 2.927 | 2.927 | 2.928 | 16.8 | 749â1357 | data |
| 69230 Hermes | 1937-10-30 | 1.926 | 1.926 | 1.927 | 17.5 | 668â2158 | data |
| 69230 Hermes | 1942-04-26 | 1.651 | 1.651 | 1.651 | 17.5 | 668â2158 | data |
| (137108) 1999 AN10 | 1946-08-07 | 2.432 | 2.429 | 2.435 | 17.9 | 556â1795 | data |
| (33342) 1998 WT24 | 1956-12-16 | 3.523 | 3.523 | 3.523 | 17.9 | 556â1795 | data |
| (163243) 2002 FB3 | 1961-04-12 | 4.903 | 4.900 | 4.906 | 16.4 | 1669â1695 | data |
| (192642) 1999 RD32 | 1969-08-27 | 3.627 | 3.625 | 3.630 | 16.3 | 1161â3750 | data |
| (143651) 2003 QO104 | 1981-05-18 | 2.761 | 2.760 | 2.761 | 16.0 | 1333â4306 | data |
| 2017 CH1 | 1992-06-05 | 4.691 | 3.391 | 6.037 | 17.9 | 556â1795 | data |
| (170086) 2002 XR14 | 1995-06-24 | 4.259 | 4.259 | 4.260 | 18.0 | 531â1714 | data |
| (33342) 1998 WT24 | 2001-12-16 | 4.859 | 4.859 | 4.859 | 17.9 | 556â1795 | data |
| 4179 Toutatis | 2004-09-29 | 4.031 | 4.031 | 4.031 | 15.3 | 2440â2450 | data |
| (671294)2014 JO25 | 2017-04-19 | 4.573 | 4.573 | 4.573 | 17.8 | 582â1879 | data |
| (137108) 1999 AN10 | 2027-08-07 | 1.014 | 1.010 | 1.019 | 17.9 | 556â1795 | data |
| (35396) 1997 XF11 | 2028-10-26 | 2.417 | 2.417 | 2.418 | 16.9 | 881â2845 | data |
| (154276) 2002 SY50 | 2071-10-30 | 3.415 | 3.412 | 3.418 | 17.6 | 714â1406 | data |
| (164121) 2003 YT1 | 2073-04-29 | 4.409 | 4.409 | 4.409 | 16.2 | 1167â2267 | data |
| (385343) 2002 LV | 2076-08-04 | 4.184 | 4.183 | 4.185 | 16.6 | 1011â3266 | data |
| (52768) 1998 OR2 | 2079-04-16 | 4.611 | 4.611 | 4.612 | 15.8 | 1462â4721 | data |
| (33342) 1998 WT24 | 2099-12-18 | 4.919 | 4.919 | 4.919 | 17.9 | 556â1795 | data |
| (85182) 1991 AQ | 2130-01-27 | 4.140 | 4.139 | 4.141 | 17.1 | 1100 | data |
| 314082 Dryope | 2186-07-16 | 3.709 | 2.996 | 4.786 | 17.5 | 668â2158 | data |
| (137126) 1999 CF9 | 2192-08-21 | 4.970 | 4.967 | 4.973 | 18.0 | 531â1714 | data |
| (290772) 2005 VC | 2198-05-05 | 1.951 | 1.791 | 2.134 | 17.6 | 638â2061 | data |
| (A) List includes near-Earth approaches of less than 5 lunar distances (LD) of objects with H brighter than 18. (B) Nominal geocentric distance from the Earth's center to the object's center (Earth radiusâ0.017 LD). (C) Diameter: estimated, theoretical mean-diameter based on H and albedo range between X and Y. (D) Reference: data source from the JPL SBDB, with AU converted into LD (1 AUâ390 LD) (E) Color codes: unobserved at close approach observed during close approach upcoming approaches | |||||||
Physical characteristics
Photometry by the Sloan Digital Sky Survey has characterized 2002 SY50 as an uncommon K-type asteroid,[5] which is typically seen among members of the Eos family in the asteroid belt.[7]:â23â
Rotation period
In October 2002, a rotational lightcurve of this asteroid was obtained from photometric observations by Italian astronomer Gianluca Masi at the Campo Catino Astronomical Observatory (468). Lightcurve analysis gave a well-defined rotation period of 4.823 hours with a brightness amplitude of 0.52 magnitude (U=3).[a]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures 1.06 kilometers in diameter and its surface has an albedo of 0.14,[4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 0.897 kilometers based on an absolute magnitude of 17.6.[3]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 2 April 2007 (M.P.C. 59337).[8] As of 2018, it has not been named.[1]
Notes
- Lightcurve plot of (154276) 2002 SY50 from October 2002. Rotation period 4.823 hours with a brightness amplitude of 0.52 mag. Quality code of 3. Summary figures at the LCDB.