(154276) 2002 SY50

Last updated

(154276) 2002 SY50
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln Lab's ETS
Discovery date30 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
Mean diameter
0.897  km (calculated) [3]
1.060±0.346 km [4]
4.823  h [lower-alpha 1]
0.143±0.173 [4]
0.20(assumed) [3]
K [5]  · S (assumed) [3]
17.00 [5]
17.6 [2] [3] [4]

    (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] [lower-alpha 1] It will make a close encounter with Earth on 30 October 2071. [6]

    Contents

    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]

    History of close approaches of large near-Earth objects since 1908 (A)
    PHA DateApproach distance (lunar dist.) Abs.
    mag
    ( H )    		Diameter (C)
    (m)    		Ref (D)
    Nomi-
    nal(B)    		Mini-
    mum    		Maxi-
    mum
    (33342) 1998 WT24 1908-12-163.5423.5373.54717.9556–1795 data
    (458732) 2011 MD5 1918-09-170.9110.9090.91317.9556–1795 data
    (7482) 1994 PC1 1933-01-172.9272.9272.92816.8749–1357 data
    69230 Hermes 1937-10-301.9261.9261.92717.5668–2158 data
    69230 Hermes1942-04-261.6511.6511.65117.5668–2158 data
    (137108) 1999 AN10 1946-08-072.4322.4292.43517.9556–1795 data
    (33342) 1998 WT24 1956-12-163.5233.5233.52317.9556–1795 data
    (163243) 2002 FB3 1961-04-124.9034.9004.90616.41669–1695 data
    (192642) 1999 RD32 1969-08-273.6273.6253.63016.31161–3750 data
    (143651) 2003 QO104 1981-05-182.7612.7602.76116.01333–4306 data
    2017 CH1 1992-06-054.6913.3916.03717.9556–1795 data
    (170086) 2002 XR14 1995-06-244.2594.2594.26018.0531–1714 data
    (33342) 1998 WT24 2001-12-164.8594.8594.85917.9556–1795 data
    4179 Toutatis 2004-09-294.0314.0314.03115.32440–2450 data
    2014 JO25 2017-04-194.5734.5734.57317.8582–1879 data
    (137108) 1999 AN10 2027-08-071.0141.0101.01917.9556–1795 data
    (35396) 1997 XF11 2028-10-262.4172.4172.41816.9881–2845 data
    (154276) 2002 SY50 2071-10-303.4153.4123.41817.6714–1406 data
    (164121) 2003 YT1 2073-04-294.4094.4094.40916.21167–2267 data
    (385343) 2002 LV 2076-08-044.1844.1834.18516.61011–3266 data
    (52768) 1998 OR2 2079-04-164.6114.6114.61215.81462–4721 data
    (33342) 1998 WT24 2099-12-184.9194.9194.91917.9556–1795 data
    (85182) 1991 AQ 2130-01-274.1404.1394.14117.11100 data
    314082 Dryope 2186-07-163.7092.9964.78617.5668–2158 data
    (137126) 1999 CF9 2192-08-214.9704.9674.97318.0531–1714 data
    (290772) 2005 VC 2198-05-051.9511.7912.13417.6638–2061 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≈0.017 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 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 ). [lower-alpha 1]

    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

    1. 1 2 3 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.

    Related Research Articles

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    <span class="nowrap">(163348) 2002 NN<sub>4</sub></span>

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    References

    1. 1 2 3 4 5 6 "154276 (2002 SY50)". Minor Planet Center. Retrieved 20 April 2018.
    2. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 154276 (2002 SY50)" (2014-06-07 last obs.). Jet Propulsion Laboratory . Retrieved 20 April 2018.
    3. 1 2 3 4 5 6 "LCDB Data for (154276)". Asteroid Lightcurve Database (LCDB). Retrieved 20 April 2018.
    4. 1 2 3 4 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.
    5. 1 2 3 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.
    6. 1 2 "Close-Approach Data, JPL Small-Body Database Browser: 154276 (2002 SY50)". Jet Propulsion Laboratory. Retrieved 20 April 2018.
    7. ↑ 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.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 20 April 2018.
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