Misplaced Pages

2016 WF9

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.

2016 WF9
Artist's rendition of 2016 WF9
Discovery
Discovered byNEOWISE
Discovery siteEarth orbit
Discovery date27 November 2016
(discovery: first observed)
Designations
MPC designation2016 WF9
Minor planet categoryNEO · PHA · Apollo
Orbital characteristics
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc(192 days)
Aphelion4.7614 AU
Perihelion0.9816 AU
Semi-major axis2.8715 AU
Eccentricity0.6582
Orbital period (sidereal)4.87 yr (1,777 days)
Mean anomaly43.511°
Mean motion0° 12 9.36 / day
Inclination14.995°
Longitude of ascending node125.41°
Argument of perihelion342.45°
Earth MOID0.0156 AU (6.1 LD)
Jupiter MOID0.5211 AU
TJupiter2.893 (comet-like)
Physical characteristics
Mean diameter0.5–1.0 km
Geometric albedo<0.05 (dark)
Absolute magnitude (H)20.2

2016 WF9 is a dark, sub-kilometer asteroid and suspected extinct comet, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.

Description

2016 WF9 is unusually dark for a near-Earth asteroid. It is possibly an extinct comet, but without the comet-like dust and gas cloud. It was first observed on 27 November 2016 by NEOWISE, the asteroid-and-comet-hunting portion of the Wide-Field Infrared Survey Explorer (WISE) mission. According to NEOWISE, this object could have cometary origins, which illustrates the blurry boundary between asteroids and comets. It is speculated that over time, this object has lost the majority of the volatiles on its surface.

2016 WF9 is about 0.5–1.0 km (0.3–0.6 mi) across so is one of the larger potentially hazardous asteroid near-Earth object (also see list of largest PHAs).

2017 approach

2016 WF9 passed Earth on 25 February 2017 at a distance of 0.3407 AU (50,970,000 km; 31,670,000 mi) and is not considered a threat for the foreseeable future. The 2017 approach did not bring it particularly close to Earth. In December 1944 it passed about 0.19 AU (28,000,000 km; 18,000,000 mi) from Earth and in February 2149 it will pass about 0.06 AU (9,000,000 km; 5,600,000 mi) from Earth.

Discovery

When 2016 WF9 was first announced and had a short insignificant 3 day observation arc, it was estimated to have a 7.6 year orbital period. The preliminary orbit was also listed on the JPL Sentry Risk Table, but none of the virtual impact dates were before 2029. As the observation arc became longer and the orbital parameters better constrained, it was removed from the Sentry Risk Table on 20 December 2016. With a 111-day observation arc, it is now known that it has a 4.86 year orbital period and currently stays inside the orbit of Jupiter.

A simulation of 2016 WF9's dynamics over a period of 100 million days (~274,000 years) found that it had roughly a 60% chance of originating from the outer Solar System as a long-period comet.

Orbit of 2016 WF9 on 25 February 2017, closest approach to Earth.

References

  1. ^ "MPEC 2016-W125: 2016 WF9". IAU Minor Planet Center. 30 November 2016. Retrieved 2 February 2017. (K16W09F)
  2. ^ "JPL Small-Body Database Browser: (2016 WF9)" (2017-04-20 last obs.). Jet Propulsion Laboratory. Retrieved 8 February 2018.
  3. ^ "2016 WF9". Minor Planet Center. Retrieved 8 February 2018.
  4. ^ Agle, DC; Cantillo, Laurie; Brown, Dwayne (29 December 2016). "NASA's NEOWISE Mission Spies One Comet, Maybe Two". NASA. Retrieved 29 December 2016.
  5. Williams, Matt (30 December 2016). "NASA'S NEOWISE Missions Spots New Comets". Universe Today. Retrieved 31 December 2016.
  6. "Tracking News". hohmanntransfer. 1 December 2016. Archived from the original on 3 February 2017. Retrieved 2 February 2017.
  7. "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 2 February 2017.
  8. Odasso, Alessandro (9 January 2017). "2016 WF9 – a simulation based on Jan 5th orbital params". odassoastro.blogspot.it. Retrieved 9 January 2017.

External links

2017 in space
Space probe launches Space probes launched in 2017
  • ASTERIA (miniature space telescope; August 2017)


Impact events
Selected NEOs
Exoplanets Exoplanets discovered in 2017
Discoveries
Comets Comets in 2017
Space exploration
Small Solar System bodies
Minor planets
Asteroid
Distant minor planet
Comets
Other
Portals: Categories: