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4034 Vishnu (1986 PA)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004034
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 76 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4441281549688664 6.6018e-08  
a 1.059782692407996 9.0463e-09 au
q .5891033605608949 7.0483e-08 au
i 11.17029424872443 7.5933e-06 deg
node 157.9299804351317 4.2451e-05 deg
peri 296.66576408612 3.9229e-05 deg
M 254.5593045815552 2.8165e-05 deg
tp 2459117.215738329541
(2020-Sep-24.71573833)
3.244e-05 TDB
period 398.49571962596
1.09
5.1023e-06
1.397e-08
d
yr
n .9033974074750584 1.1567e-08 deg/d
Q 1.530462024255097 1.3064e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.859451038580857E-14 1.322E-14
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      488  
   # delay obs. used      0  
   # Doppler obs. used      1  
   data-arc span      12383 days (33.90 yr)  
   first obs. used      1986-08-02  
   last obs. used      2020-06-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42741  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-28 06:13:01  

Additional Information
 Earth MOID = .019585 au 
 Jupiter MOID = 3.6837 au 
 T_jup = 5.703 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 18.4   n/a MPO263383  
diameter diameter 0.42 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
rotation period rot_per 44.4 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.52   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130  
SMASSII spectral type spec_B O   n/a Binzel et al. (2004) Icarus 170, 259-294  

4034 Vishnu           Discovered 1986 Aug. 2 by E. F. Helin at Palomar.
Vishnu is the Hindu god of preservation. Name suggested by J. Meeus.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20110715/MPCPages.arcLast Updated: 2011-07-20

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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