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JPL Small-Body Database Browser
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4946 Askalaphus (1988 BW1)
Classification: Jupiter Trojan          SPK-ID: 2004946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04991205827815039 5.3878e-08  
a 5.318584272970716 9.6186e-08 au
q 5.053122784780947 2.7863e-07 au
i 21.86033775736802 6.0282e-06 deg
node 59.03267035063407 1.5743e-05 deg
peri 206.2463132254405 7.4406e-05 deg
M 83.9023760422815 6.9522e-05 deg
tp 2457956.346728604866
(2017-Jul-21.84672860)
0.00087166 TDB
period 4480.149376375475
12.27
0.00012153
3.327e-07
d
yr
n .08035446360300753 2.1798e-09 deg/d
Q 5.584045761160485 1.0099e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1439  
   data-arc span      25185 days (68.95 yr)  
   first obs. used      1950-12-11  
   last obs. used      2019-11-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50775  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 21:09:59  

Additional Information
 Earth MOID = 4.0491 au 
 Jupiter MOID = .302475 au 
 T_jup = 2.853 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.2   n/a MPO384798  
diameter diameter 48.209 km 0.430 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 22.731 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
geometric albedo albedo 0.069   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4946 Askalaphus (1988 BW1)          Discovered 1988-Jan-21 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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