(456938) 2007 YV56

(456938) 2007 YV56, provisional designation 2007 YV56, is a sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 190–360 meters (620–1,200 ft) in diameter. It was discovered on 31 December 2007, by astronomers of the Catalina Sky Survey conducted at the Catalina Station in Arizona, United States.[1]

(456938) 2007 YV56
Discovery [1]
Discovered byCSS
Discovery siteMount Lemmon Obs.
Discovery date31 December 2007
Designations
(456938) 2007 YV56
2007 YV56
NEO · Apollo · PHA [1][2]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc8.10 yr (2,959 days)
Aphelion2.5556 AU
Perihelion0.5952 AU
1.5754 AU
Eccentricity0.6222
1.98 yr (722 days)
87.984°
0° 29m 54.24s / day
Inclination6.2441°
102.42°
265.73°
Earth MOID0.0047 AU (1.83 LD)
Venus MOID0.0019 AU
Mars MOID0.0571 AU
Physical characteristics
Mean diameter
0.19 km (est. at 0.20)[3]
0.36 km (est. at 0.057)[3]
21.0[2]

    Orbit and classification

    2007 YV56 is an Apollo asteroid that crosses the orbit of Earth.[1][2] Apollo's are the largest group of near-Earth objects with nearly 10 thousand known members.[4]

    It orbits the Sun at a distance of 0.60–2.55 AU once every 2 years (722 days; semi-major axis of 1.58 AU). Its orbit has a high eccentricity of 0.62 and an inclination of 6° with respect to the ecliptic.[2] This makes it also a Mars-crossing asteroid, as it crosses the orbit of the Red Planet at 1.66 AU, as well as a Venus-crosser due to its aphelion of less than 0.71 AU. The body's observation arc begins at Catalina with its official discovery observation in December 2007.[1]

    Close approaches

    2007 YV56 has a minimum orbital intersection distance (MOID) with Earth of 703,000 km; 437,000 mi (0.0047 AU), which corresponds to 1.83 lunar distances (LD).[2] It has an absolute magnitude of 21.0. This makes it a potentially hazardous asteroid,[1][2] which are defined as having a MOID of less than 0.05 AU (19 LD) and an absolute magnitude brighter than 22. Besides Earth, it also makes close approaches to Venus, Mars and the Moon.[2]

    On 26 December 2007, five days prior to its discovery observation, it passed Earth at a nominal distance of 0.10037 AU (39.06 LD). On 2 January 2101, it is predicted to flyby Earth at 0.00159 AU (0.62 LD) and pass the Moon at a similar distance five hours earlier as well (also see List of asteroid close approaches to Earth § Predicted encounters).[2]

    History of closest approaches of large near-Earth objects since 1914
    (less than H 24 and 1 LD)(A)
    NEO Date Approach distance in lunar distances Abs. mag
    (H)    		 Diameter (C)
    (m)    		 Ref (D)
    Nominal(B) Minimum Maximum
    (152680) 1998 KJ91914-12-310.6060.6040.60819.4279–900data
    (458732) 2011 MD51918-09-170.9110.9090.91317.9556–1795data
    (163132) 2002 CU111925-08-300.9030.9010.90518.5443–477data
    2010 VB11936-01-060.5530.5530.55323.248–156data
    2002 JE91971-04-110.6160.5870.65121.2122–393data
    2013 UG11976-10-170.8540.8530.85522.373–237data
    2012 TY521981-11-040.8180.8130.82321.4111–358data
    2012 UE341991-04-080.8470.6761.02723.346–149data
    2017 VW132001-11-080.4540.3183.43620.7153–494data
    2002 MN2002-06-140.3120.3120.31223.640–130data
    (308635) 2005 YU552011-11-080.8450.8450.84521.9320–400data
    2011 XC22011-12-030.9040.9010.90723.248–156data
    2018 AH2018-01-020.7730.7720.77322.567–216data
    2018 GE32018-04-150.5020.5010.50323.735–135data
    2010 WC92018-05-150.5280.5280.52823.542–136data
    (153814) 2001 WN52028-06-260.6470.6470.64718.2921–943data
    99942 Apophis2029-04-130.09810.09630.100019.7310–340data
    2012 UE342041-04-080.2830.2740.35423.346–149data
    2015 XJ3512047-06-060.7890.25138.13522.470–226data
    2007 TV182058-09-220.9180.9170.91923.837–119data
    2005 WY552065-05-280.8650.8560.87420.7153–494data
    (308635) 2005 YU552075-11-080.5920.4990.75221.9320–400data
    (456938) 2007 YV562101-01-020.6210.6150.62821.0133–431data
    2007 UW12129-10-190.2390.1550.38122.761–197data
    101955 Bennu2135-09-250.7800.3081.40620.19472–512data
    (153201) 2000 WO1072140-12-010.6340.6310.63719.3427–593data
    2009 DO1112146-03-230.8960.7441.28822.858–188data
    (85640) 1998 OX42148-01-220.7710.7700.77121.1127–411data
    2007 UY12156-02-130.6850.6526.85622.956–179data
    2011 LT172156-12-160.9980.9551.21521.6101–327data
    (A) This list includes near-Earth approaches of less than 1 lunar distances (LD) of objects with H brighter than 24.
    (B) Nominal geocentric distance from the center of Earth to the center of the object (Earth has a radius of approximately 6,400 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
    Note: All close approaches between 1900 and 2200 are listed (with H<24 at less than 1 LD). Objects not observed during the approach,
    and simply estimated to have approached on this date, are colored grey. Generically estimated asteroid diameters are given in italics.

    Physical characteristics

    The body's spectral type is unknown. Near-Earth asteroids are often of a stony composition.

    Diameter and albedo

    Based on a generic magnitude-to-diameter conversion, 2007 YV56 measures 190–360 meters (620–1,180 ft) in diameter, for an absolute magnitude of 21.0, and an assumed albedo of 0.20 and 0.057, which represent typical values for stony and carbonaceous asteroids, respectively.[3]

    Rotation period

    As of 2018, no rotational lightcurve of 2007 YV56 has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 22 February 2016 (M.P.C. 98584).[5] As of 2018, it has not been named.[1]

    References
    1. "456938 (2007 YV56)". Minor Planet Center. Retrieved 27 February 2018.
    2. "JPL Small-Body Database Browser: 456938 (2007 YV56)" (2016-02-06 last obs.). Jet Propulsion Laboratory. Retrieved 27 February 2018.
    3. "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 12 November 2017.
    4. "List Of Apollo Minor Planets (by designation)". Minor Planet Center. Retrieved 27 February 2018.
    5. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 February 2018.
    Preceded by
    2005 WY55    		 Large NEO Earth close approach
    (inside the orbit of the Moon)
    2 January 2101    		 Succeeded by
    2007 UW1

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