(85990) 1999 JV₆

(85990) 1999 JV₆
	Radar images of 1999 JV6 taken by the Goldstone Radar on 12 January 2015
Discovery
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	13 May 1999
Designations
MPC designation	1999 JV6
Minor planet category	Apollo · NEO · PHA
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	20.76 yr (7,582 days)
Aphelion	1.3219 AU
Perihelion	0.6946 AU
Semi-major axis	1.0082 AU
Eccentricity	0.31110
Orbital period (sidereal)	1.01 yr
Mean anomaly	194.713°
Mean motion	0° 58m 24.915s / day
Inclination	5.359°
Longitude of ascending node	124.318°
Argument of perihelion	235.531°
Earth MOID	0.03152 AU
Physical characteristics
Mean diameter	0.451±0.026 km
Synodic rotation period	6.538 h
Geometric albedo	0.095±0.023
Spectral type	Xk (SMASS)
Absolute magnitude (H)	20.2

(85990) 1999 JV₆, provisional designation 1999 JV₆, is a sub-kilometer near-Earth asteroid and a potentially hazardous object of the Apollo group. It was discovered by astronomers of the LINEAR program at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. 1999 JV₆ is a contact binary object consisting of two distinct lobes, as seen in radar images from various observatories including Arecibo and Goldstone in January 2015.

Close approaches

Radar images of 1999 JV₆ taken by the Goldstone Radar on 9 January 2015

In January 2015, 1999 JV₆ approached Earth within a distance of 32.4 lunar distances (0.0833 AU).^[1] During the encounter, 1999 JV₆ was observed by radar from the Arecibo, Green Bank, and Goldstone observatories.^[3] In January 2016, 1999 JV₆ has made another close approach at a distance of 12 lunar distances (0.032 AU), several times closer than the encounter in 2015.^[1]^[3]

The Minor Planet Center has classified 1999 JV₆ as a potentially hazardous asteroid due to its large size and small Earth minimum orbit intersection distance (MOID) of 0.03 AU.^[4]^[1]

Physical characteristics

1999 JV₆ was discovered in May 1999 by the Lincoln Near-Earth Asteroid Research (LINEAR) program at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. Most properties of 1999 JV₆ have been determined through photometry, spectroscopy, infrared radiometry, and radar imaging.^[3]

Binzel et al. (2001) have found that 1999 JV₆ has a spectral class of an Xk-type asteroid. Thermal infrared observations using the WISE spacecraft by Mainzer et al. (2011) and the Spitzer Space Telescope by Mueller et al. (2011) give a diameter of 0.45 km (0.28 mi). Warner et al. (2014, 2015) suggest that 1999 JV₆ has a highly elongated shape due to its large light curve amplitude of 0.9 magnitudes. Based on 1999 JV₆'s large brightness changes, they measured a rotation period of 6.54 hours. In January 2015, radar imaging by the Arecibo Observatory and the Green Bank Observatory confirmed 1999 JV₆'s elongated shape and provided delay-Doppler images used to obtain a preliminary estimate of a 3D model for its shape. The radar data reveal an apparent concavity and suggest that 1999 JV₆ is a contact binary.^[4]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "JPL Small-Body Database Browser: 85990 (1999 JV6)" (2020-02-14 last obs.). Jet Propulsion Laboratory. 15 February 2020. Retrieved 30 April 2020.
^ ^a ^b ^c "(85990) = 1999 JV6". Minor Planet Center. International Astronomical Union. Retrieved 30 April 2020.
^ ^a ^b ^c "Goldstone Radar Observations Planning: 1999 JV6, 2001 WL15, and Toro". echo.jpl.nasa.gov. Retrieved 29 April 2020. This article incorporates text from this source, which is in the public domain.
^ ^a ^b Rożek, A.; Lowry, S. C.; Nolan, M. C.; Taylor, P. A.; Benner, L. a. M.; Fitzsimmons, A.; Zegmott, T. J.; Weissman, P. R.; Green, S. F.; Rozitis, B.; Snodgrass, C. (1 November 2019). "Shape model and spin-state analysis of PHA contact binary (85990) 1999 JV6 from combined radar and optical observations". Astronomy & Astrophysics. 631: A149. doi:10.1051/0004-6361/201936302. hdl:10150/641764. ISSN 0004-6361.

External links

Goldstone Radar Observations Planning: 1999 JV6, 2001 WL15, and Toro, JPL Asteroid Radar Research
3D model of the asteroid
(85990) 1999 JV6 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
(85990) 1999 JV6 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
(85990) 1999 JV6 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[jpldata-1] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "JPL Small-Body Database Browser: 85990 (1999 JV6)" (2020-02-14 last obs.). Jet Propulsion Laboratory. 15 February 2020. Retrieved 30 April 2020.

[MPC-object-2] "(85990) = 1999 JV6". Minor Planet Center. International Astronomical Union. Retrieved 30 April 2020.

[:0-3] "Goldstone Radar Observations Planning: 1999 JV6, 2001 WL15, and Toro". echo.jpl.nasa.gov. Retrieved 29 April 2020. This article incorporates text from this source, which is in the public domain.

[Rozek2019-4] Rożek, A.; Lowry, S. C.; Nolan, M. C.; Taylor, P. A.; Benner, L. a. M.; Fitzsimmons, A.; Zegmott, T. J.; Weissman, P. R.; Green, S. F.; Rozitis, B.; Snodgrass, C. (1 November 2019). "Shape model and spin-state analysis of PHA contact binary (85990) 1999 JV6 from combined radar and optical observations". Astronomy & Astrophysics. 631: A149. doi:10.1051/0004-6361/201936302. hdl:10150/641764. ISSN 0004-6361.

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