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

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2356920286252608 4.4086e-08  
a 2.293263345517533 9.1234e-09 AU
q 1.752759455440553 1.0427e-07 AU
i 8.163037820136367 5.2036e-06 deg
node 17.28220576076409 3.6439e-05 deg
peri 339.80270115 3.7757e-05 deg
M 262.1401650505691 1.192e-05 deg
tp 2457145.311148724271
(2015-May-02.81114872)
4.3024e-05 JED
period 1268.46743206631
3.47
7.5696e-06
2.072e-08
d
yr
n .2838070500663676 1.6936e-09 deg/d
Q 2.833767235594513 1.1274e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1145  
   data-arc span      30252 days (82.83 yr)  
   first obs. used      1931-08-07  
   last obs. used      2014-06-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51917  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:19:55  

Additional Information
 Earth MOID = .750537 AU 
 T_jup = 3.546 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.0 mag n/a MPO263363  
rotation period rot_per 10.223 h n/a Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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 Bul. 39, 51-55.]

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

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