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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05027992788117809 5.3786e-08  
a 5.317589463215864 9.6598e-08 au
q 5.050221448503658 2.7879e-07 au
i 21.86055699353075 6.0284e-06 deg
node 59.02990218021659 1.5744e-05 deg
peri 205.8504644680892 7.3915e-05 deg
M 52.10200745420226 6.9217e-05 deg
tp 2457952.279755057930
(2017-Jul-17.77975506)
0.00086522 TDB
period 4478.892456960866
12.26
0.00012204
3.341e-07
d
yr
n .08037701361650387 2.1902e-09 deg/d
Q 5.58495747792807 1.0146e-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 = 4.04569 au 
 Jupiter MOID = .304411 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-January); 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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