(154276) 2002 SY₅₀

(154276) 2002 SY₅₀
Discovery
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	30 September 2002
Designations
MPC designation	(154276) 2002 SY50
Alternative designations	2002 SY50
Minor planet category	Apollo · NEO · PHA
Orbital characteristics
	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
Semi-major axis	1.7045 AU
Eccentricity	0.6892
Orbital period	2.23 yr (813 d)
Mean anomaly	305.15°
Mean motion	0° 26m 34.44s / day
Inclination	8.7443°
Longitude of ascending node	34.298°
Argument of perihelion	99.395°
Earth MOID	0.0027 AU (1.0519 LD)
Physical characteristics
Mean diameter	0.897 km (calculated); 1.060±0.346 km
Rotation period	4.823 h
Geometric albedo	0.143±0.173; 0.20 (assumed)
Spectral type	K · S (assumed)
Absolute magnitude (H)	17.00; 17.6

(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]

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 0.53–2.88 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]

show

History of close approaches of large near-Earth objects since 1908 ^(A)

PHA	Date	Approach distance (lunar dist.)			Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
PHA	Date	Nomi- nal^(B)	Mini- mum	Maxi- mum	Abs. mag (H)	Diameter ^(C) (m)	Ref ^(D)
(33342) 1998 WT24	1908-12-16	3.542	3.537	3.547	17.9	556–1795	data
(458732) 2011 MD5	1918-09-17	0.911	0.909	0.913	17.9	556–1795	data
(7482) 1994 PC1	1933-01-17	2.927	2.927	2.928	16.8	749–1357	data
69230 Hermes	1937-10-30	1.926	1.926	1.927	17.5	668–2158	data
69230 Hermes	1942-04-26	1.651	1.651	1.651	17.5	668–2158	data
(137108) 1999 AN10	1946-08-07	2.432	2.429	2.435	17.9	556–1795	data
(33342) 1998 WT24	1956-12-16	3.523	3.523	3.523	17.9	556–1795	data
(163243) 2002 FB3	1961-04-12	4.903	4.900	4.906	16.4	1669–1695	data
(192642) 1999 RD32	1969-08-27	3.627	3.625	3.630	16.3	1161–3750	data
(143651) 2003 QO104	1981-05-18	2.761	2.760	2.761	16.0	1333–4306	data
	1992-06-05	4.691	3.391	6.037	17.9	556–1795	data
	1995-06-24	4.259	4.259	4.260	18.0	531–1714	data
(33342) 1998 WT24	2001-12-16	4.859	4.859	4.859	17.9	556–1795	data
4179 Toutatis	2004-09-29	4.031	4.031	4.031	15.30	2440–2450	data
2014 JO25	2017-04-19	4.573	4.573	4.573	17.8	582–1879	data
(137108) 1999 AN10	2027-08-07	1.014	1.010	1.019	17.9	556–1795	data
(35396) 1997 XF11	2028-10-26	2.417	2.417	2.418	16.9	881–2845	data
(154276) 2002 SY50	2071-10-30	3.415	3.412	3.418	17.6	714–1406	data
(164121) 2003 YT1	2073-04-29	4.409	4.409	4.409	16.2	1167–2267	data
(385343) 2002 LV	2076-08-04	4.184	4.183	4.185	16.6	1011–3266	data
(52768) 1998 OR2	2079-04-16	4.611	4.611	4.612	15.8	1462–4721	data
(33342) 1998 WT24	2099-12-18	4.919	4.919	4.919	17.9	556–1795	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	668–2158	data
	2192-08-21	4.970	4.967	4.973	18.0	531–1714	data
	2198-05-05	1.951	1.791	2.134	17.6	638–2061	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 radius≈6400 km). ^(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 AU≈390 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]^: 23

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[]

^ Jump up to: ^a ^b ^c 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.

References[]

^ Jump up to: ^a ^b ^c ^d ^e ^f "154276 (2002 SY50)". Minor Planet Center. Retrieved 20 April 2018.
^ Jump up to: ^a ^b ^c ^d ^e ^f ^g "JPL Small-Body Database Browser: 154276 (2002 SY50)" (2014-06-07 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2018.
^ Jump up to: ^a ^b ^c ^d ^e ^f "LCDB Data for (154276)". Asteroid Lightcurve Database (LCDB). Retrieved 20 April 2018.
^ Jump up to: ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.
^ Jump up to: ^a ^b ^c Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. S2CID 119258489.
^ Jump up to: ^a ^b "Close-Approach Data, JPL Small-Body Database Browser: 154276 (2002 SY50)". Jet Propulsion Laboratory. Retrieved 20 April 2018.
^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.
^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 April 2018.

External links[]

List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center
PHA Close Approaches To The Earth, Minor Planet Center
Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
(154276) 2002 SY50 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
(154276) 2002 SY50 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical Properties · Summary
(154276) 2002 SY50 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

[lcdb-Masi-2002-5] Jump up to: ^a ^b ^c 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.

[MPC-object-1] Jump up to: ^a ^b ^c ^d ^e ^f "154276 (2002 SY50)". Minor Planet Center. Retrieved 20 April 2018.

[jpldata-2] Jump up to: ^a ^b ^c ^d ^e ^f ^g "JPL Small-Body Database Browser: 154276 (2002 SY50)" (2014-06-07 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2018.

[lcdb-3] Jump up to: ^a ^b ^c ^d ^e ^f "LCDB Data for (154276)". Asteroid Lightcurve Database (LCDB). Retrieved 20 April 2018.

[Nugent-2015-4] Jump up to: ^a ^b ^c ^d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.

[Carry-2016-6] Jump up to: ^a ^b ^c Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. S2CID 119258489.

[jpldata-close-7] Jump up to: ^a ^b "Close-Approach Data, JPL Small-Body Database Browser: 154276 (2002 SY50)". Jet Propulsion Laboratory. Retrieved 20 April 2018.

[Nesvorny-2014-8] Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131. S2CID 119280014.

[MPC-Circulars-Archive-9] "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 April 2018.

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(154276) 2002 SY50