Astronomy:(242450) 2004 QY2

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(242450) 2004 QY2
Discovery[1][2]
Discovered bySSS
Discovery siteSiding Spring Obs.
Discovery date20 August 2004
Designations
(242450) 2004 QY2
2004 QY2
Minor planet categoryApollo · NEO · PHA[1][3]
Orbital characteristics[3]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc11.61 yr (4,242 days)
|{{{apsis}}}|helion}}1.6013 AU
|{{{apsis}}}|helion}}0.5666 AU
1.0840 AU
Eccentricity0.4773
Orbital period1.13 yr (412 days)
Mean anomaly123.98°
Mean motion0° 52m 23.88s / day
Inclination37.026°
Longitude of ascending node295.31°
104.96°
Earth MOID0.0469 AU · 18.3 LD
Physical characteristics
Mean diameter2.914±0.084 km[4]
3.320 km[5]
Geometric albedo0.274±0.044[4]
Absolute magnitude (H)14.7[1][3]


(242450) 2004 QY2 (prov. designation: 2004 QY2) is an asteroid on an eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 3 kilometers (2 miles) in diameter. It was discovered on 20 August 2004 by the Siding Spring Survey at an apparent magnitude of 16.5 using the 0.5-metre (20 in) Uppsala Southern Schmidt Telescope.[2] It is one of the largest potentially hazardous asteroids known to exist.[6]

Orbit and classification

2004 QY2 orbits the Sun at a distance of 0.6–1.6 AU once every 14 months (412 days; semi-major axis of 1.08 AU). Its orbit has an eccentricity of 0.48 and an inclination of 37° with respect to the ecliptic.[3] The body's observation arc begins with its official discovery observation at Siding Spring.[1]

The object is a member of the Apollo asteroids, the largest subgroup of near-Earth asteroids which cross the orbit of Earth. Unlike many other members of this dynamical group, 2004 QY2 is not a Mars-crosser, as its aphelion is too small to cross the orbit of the Red Planet at 1.66 AU.[3]

Close approaches

With an absolute magnitude of 14.7, 2004 QY2 is one of the brightest potentially hazardous asteroids ever discovered (see PHA-list).[6][7] It has an Earth minimum orbital intersection distance of 0.0469 AU (7,020,000 km), which translates into 18.3 lunar distances.[3] On 29 July 2012, it passed Earth at a distance of 0.4314 AU (64,540,000 km; 40,100,000 mi).[3]

Sentry Risk Table

Due to its originally estimated size of 5.5 kilometers, 2004 QY2 was one of the largest objects to appear on the Sentry Risk Table.[8] It was removed from the Sentry Risk Table on 25 August 2004.[9]

Physical characteristics

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2004 QY2 has an albedo of 0.274, and it measures 2.914 and 3.320 kilometers in diameter, respectively.[4][5]

As of 2018, no rotational lightcurve of 2004 QY2 has been obtained from photometric observations. The body's rotation period, shape and spin axis remain unknown.[10] In addition, the body's spectral type has never been assessed.[3][10]

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 26 June 2006.[11] As of 2018, it has not been named.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 "242450 (2004 QY2)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=242450. Retrieved 19 January 2018. 
  2. ↑ 2.0 2.1 "MPEC 2004-Q27 : 2004 QY2 (K04Q02Y)". IAU Minor Planet Center. 2004-08-22. https://www.minorplanetcenter.net/iau/mpec/K04/K04Q27.html. Retrieved 2012-06-17. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "JPL Small-Body Database Browser: 242450 (2004 QY2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2242450. Retrieved 19 January 2018. 
  4. ↑ 4.0 4.1 4.2 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. doi:10.1088/0004-637X/814/2/117. Bibcode: 2015ApJ...814..117N. 
  5. ↑ 5.0 5.1 Mainzer, A.; Bauer, J.; Cutri, R. M.; Grav, T.; Masiero, J.; Beck, R. et al. (September 2014). "Initial Performance of the NEOWISE Reactivation Mission". The Astrophysical Journal 792 (1): 14. doi:10.1088/0004-637X/792/1/30. Bibcode: 2014ApJ...792...30M. 
  6. ↑ 6.0 6.1 "List of the Potentially Hazardous Asteroids (PHAs)". Minor Planet Center. https://www.minorplanetcenter.net/iau/lists/t_phas.html. Retrieved 19 January 2018. 
  7. ↑ "JPL Small-Body Database Search Engine: PHAs and H < 15 (mag)". JPL Solar System Dynamics. http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=pha;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ai;c1_op=%3C;c1_value=15;table_format=HTML;max_rows=50;format_option=comp;c_fields=AcBhBgBjBiBnBsCkCqAi;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA. Retrieved 19 January 2018. 
  8. ↑ "Major News about Minor Objects". hohmanntransfer. 22 August 2004. http://www.hohmanntransfer.com/mn/0408/22.htm#bits. 
  9. ↑ "Sentry: Earth Impact Monitoring – Removed Objects". NASA/JPL CNEOS – Center for Near-Earth Object Studies. https://cneos.jpl.nasa.gov/sentry/removed.html. 
  10. ↑ 10.0 10.1 "LCDB Data for (242450)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=242450%7C. Retrieved 19 January 2018. 
  11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 25 February 2018. 

External links



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