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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4441179182835077 6.6255e-08  
a 1.059574771616324 1.1588e-08 au
q .588998629780359 7.0441e-08 au
i 11.16785227996073 7.5974e-06 deg
node 157.9102489972211 4.2442e-05 deg
peri 296.7001970709545 3.921e-05 deg
M 75.2597505628063 3.0347e-05 deg
tp 2459117.217047231721
(2020-Sep-24.71704723)
3.2373e-05 TDB
period 398.3784529229845
1.09
6.5356e-06
1.789e-08
d
yr
n .9036633315848436 1.4825e-08 deg/d
Q 1.530150913452289 1.6735e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.860627776508534E-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.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42742  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:51:51  

Additional Information
 Earth MOID = .0189512 au 
 Jupiter MOID = 3.6839 au 
 T_jup = 5.704 
 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 18.32   n/a E2021B10  
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. 2020-October); Warner et al., 2009 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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