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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456461.5 (2013-Jun-18.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04932017322743031 5.3743e-08  
q 5.058962388656267 2.7667e-07 au
tp 2457932.050675390851
(2017-Jun-27.55067539)		 0.00088615 TDB
node 59.0540468042766 1.5742e-05 deg
peri 203.8359283538046 7.5563e-05 deg
i 21.85727496974848 6.028e-06 deg
   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
 Jupiter MOID = .302475 au 
 T_jup = 2.853 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.888324496002379E-15 -1.404572298936452E-14 -1.918136441158064E-12 -6.427799452752413E-16 -9.278928260038899E-14 -4.93351607881324E-16
q -1.404572298936452E-14 7.65441632307292E-14 -9.926242206985684E-12 5.010208095298958E-15 -1.426848595732091E-12 4.610462395631254E-15
tp -1.918136441158064E-12 -9.926242206985684E-12 7.852595435183803E-7 1.122207872350439E-10 6.552861846803125E-8 1.269989758048298E-11
node -6.427799452752413E-16 5.010208095298958E-15 1.122207872350439E-10 2.477970528944301E-10 -2.205570510006732E-10 -1.990282156112134E-11
peri -9.278928260038899E-14 -1.426848595732091E-12 6.552861846803125E-8 -2.205570510006732E-10 5.709751928632711E-9 1.948447704191373E-11
i -4.93351607881324E-16 4.610462395631254E-15 1.269989758048298E-11 -1.990282156112134E-11 1.948447704191373E-11 3.633651169114184E-11

[ 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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