1996 PW

1996 PW
Discovery [1]
Discovered by NEAT
Discovery site Haleakala Obs.
Discovery date 9 August 1996
Designations
MPC designation 1996 PW
TNO [2] · damocloid [3][4]
distant [5]
Orbital characteristics [2]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 2
Observation arc 1.39 yr (506 days)
Aphelion 501.29 AU
Perihelion 2.5187 AU
251.90 AU
Eccentricity 0.9900
3998.17 yr (1,460,331 d)
1.8997°
0° 0m 0.72s / day
Inclination 29.797°
144.54°
181.60°
Physical characteristics
Mean diameter
 7 km[3]
8 km (est. at 0.15)[1]
15 km (est. at 0.04)[1]
35.44 h[2][6]
D [6][7] · Ld (SMASS)[2][8]
B–R = 0.56±0.04
V–I = 1.03±0.06
V–J = 1.80±0.05
V–H = 2.19±0.05
V–K = 2.32±0.05[6]
14.0[2]

    1996 PW is an exceptionally eccentric trans-Neptunian object and damocloid on an orbit typical of long-period comets but that has shown no sign of cometary activity around the time it was discovered.[6]

    Description

    Simulations indicate that it has most likely come from the Oort cloud, with a roughly equal probability of being an extinct comet and a rocky body that was originally scattered into the Oort cloud.[1] The discovery of 1996 PW prompted theoretical research that suggests that roughly 1 to 2 percent of the Oort cloud objects are rocky.[1][7]

    1996 PW was discovered on 1996 August 9 by the Near-Earth Asteroid Tracking (NEAT) automated search camera on Haleakala Observatory, Hawaii.[1] It is the first object that is not an active comet discovered on an orbit typical of long-period comets.[1]

    1996 PW has a rotation period of 35.44 ± 0.02 h and a double-peaked lightcurve with an amplitude of 0.44 ± 0.03 mag.[6] Its spectrum is moderately red and featureless,[9] typical of D-type asteroids and bare comet nuclei.[6][7][9] Its spectrum suggests an extinct comet.[9] The upper limit on 1996 PW's dust production is 0.03 kg/s.[6]

    See also

    References

    1. 1 2 3 4 5 6 7 Weissman, P. R. & Levison, H. F. (1997). Origin and evolution of the unusual object 1996 PW: Asteroids from the Oort cloud?. The Astrophysical Journal, 488, L133–L136
    2. 1 2 3 4 5 "JPL Small-Body Database Browser: (1996 PW)" (1997-12-28 last obs.). Jet Propulsion Laboratory. Retrieved 17 January 2018.
    3. 1 2 Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 17 January 2018.
    4. ↑ Akimasa Nakamura (2009-05-02). "Table of Damocloid objects, or Oort cloud asteroids". Lowell Observatory. Retrieved 17 January 2018.
    5. ↑ "1996 PW". Minor Planet Center. Retrieved 17 January 2018.
    6. 1 2 3 4 5 6 7 Davies, J. K., McBride, N., Green, S. F., Mottola, S., Carsenty, U., Basran, D., Hudson, K. A., & Foster, M. J. (1998). The lightcurve and colors of unusual minor planet 1996 PW. Icarus, 132, 418–430
    7. 1 2 3 Toth, I. (2005). Connections between asteroids and cometary nuclei. Asteroids, Comets, Meteors Proceedings IAU Symposium, 229, 67–96.
    8. ↑ Bus, S. J. & Binzel, R. P. (2002). Phase II of the small main-belt asteroid spectroscopic survey – A feature-based taxonomy Archived 23 September 2015 at the Wayback Machine.. Icarus, 158, 146–177.
    9. 1 2 3 Hicks, M. D., Buratti, B. J., Newburn Jr., R. L., & Rabinowitz, D. L. (2000). Physical observations of 1996 PW and 1997 SE5: Extinct comets or D-type asteroids?. Icarus, 143(2), 354–359.

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