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896 Sphinx (A918 PE)
Classification: Main-belt Asteroid          SPK-ID: 2000896
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1631975487281988 3.6632e-08  
a 2.285799163449007 6.2399e-09 au
q 1.912762343089162 8.3339e-08 au
i 8.190329928684998 4.0071e-06 deg
node 254.1810497277601 2.3448e-05 deg
peri 1.962795125869455 2.5716e-05 deg
M 211.729046643584 1.2197e-05 deg
tp 2459520.387182456707
(2021-Nov-01.88718246)
4.3706e-05 TDB
period 1262.279505511224
3.46
5.1688e-06
1.415e-08
d
yr
n .2851983244821834 1.1678e-09 deg/d
Q 2.658835983808853 7.2583e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2796  
   data-arc span      37161 days (101.74 yr)  
   first obs. used      1918-08-01  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43161  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:14:57  

Additional Information
 Earth MOID = .897908 au 
 Jupiter MOID = 2.39572 au 
 T_jup = 3.571 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456297.5 (2013-Jan-05.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1629376584020108 3.6659e-08  
q 1.914108380175149 8.3375e-08 au
tp 2455732.048037440463
(2011-Jun-19.54803744)
3.9145e-05 TDB
node 254.2262344283845 2.3437e-05 deg
peri 1.578122601916748 2.5721e-05 deg
i 8.1906321599447 4.0089e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2796  
   data-arc span      37161 days (101.74 yr)  
   first obs. used      1918-08-01  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43161  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:14:57  

Additional Information
 Jupiter MOID = 2.39572 au 
 T_jup = 3.571 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.343903522278379E-15 -3.050517826834974E-15 -1.178846961522986E-13 4.145022316528709E-15 -5.891568503407459E-14 8.730917094273097E-16
q -3.050517826834974E-15 6.951470659312732E-15 2.979736323169979E-13 -9.925105286357936E-15 1.438184416803262E-13 -1.918741674191274E-15
tp -1.178846961522986E-13 2.979736323169979E-13 1.532313042807294E-9 -4.891799462230719E-12 4.227422277416967E-10 -9.963757602488361E-13
node 4.145022316528709E-15 -9.925105286357936E-15 -4.891799462230719E-12 5.492940315281784E-10 -5.447848120789883E-10 -1.453790327050355E-11
peri -5.891568503407459E-14 1.438184416803262E-13 4.227422277416967E-10 -5.447848120789883E-10 6.615773907867489E-10 1.410873922920185E-11
i 8.730917094273097E-16 -1.918741674191274E-15 -9.963757602488361E-13 -1.453790327050355E-11 1.410873922920185E-11 1.607141138820251E-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 11.6   n/a MPO256867  
diameter diameter 11.974 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 21.038 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Polakis, T. (2018) Minor Planet Bull. 45, 347-352.]
geometric albedo albedo 0.242   0.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

896 Sphinx (A918 PE)          Discovered 1918-Aug-01 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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