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1946 Walraven (1931 PH)
Classification: Main-belt Asteroid          SPK-ID: 2001946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2349476383591486 4.0989e-08  
a 2.293533028347429 6.3081e-09 au
q 1.754672859838495 9.469e-08 au
i 8.159120293805008 4.4063e-06 deg
node 17.24235145378088 2.6854e-05 deg
peri 340.1438064921584 2.7831e-05 deg
M 165.8880917276357 8.398e-06 deg
tp 2458415.886775372483
(2018-Oct-24.38677537)
2.9041e-05 TDB
period 1268.69119220114
3.47
5.2341e-06
1.433e-08
d
yr
n .283756994777753 1.1707e-09 deg/d
Q 2.832393196856364 7.7902e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2635  
   data-arc span      32457 days (88.86 yr)  
   first obs. used      1931-08-07  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40896  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:38:58  

Additional Information
 Earth MOID = .753807 au 
 Jupiter MOID = 2.62023 au 
 T_jup = 3.546 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.0   n/a MPO416727  
diameter diameter 9.205 km 0.109 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10.21 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:
[van Gent, H. (1933) Bul. Astron. Inst. Netherlands 7, 65-66.]
[Folberth, J.; Casimir, S.; Dou, Y.; Evans, D; et al. (2012) Minor Planet Bull. 39, 51-55.]
[Aznar Macias, A.; Carreno Garcerain, A.; Arce Masego, E.; Brines Rodriques, P.; et al. (2016) Minor Planet Bull. 43, 257-263.]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.362   0.067 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1946 Walraven (1931 PH)          Discovered 1931-Aug-08 by Van Gent, H. at Johannesburg (LS)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1931 PH = 1952 PB = 1959 RE1 = 1966 TC = 1972 JE1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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