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7771 Tvaren (1992 EZ9)
Classification: Main-belt Asteroid          SPK-ID: 2007771
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0228432095184481 2.1448e-08  
a 2.6586623430594 9.3447e-09 au
q 2.597929962118086 5.5495e-08 au
i 4.221988356599438 7.0477e-07 deg
node 176.7315890088257 1.2301e-05 deg
peri 64.0500987329666 4.9753e-05 deg
M 194.596837263755 4.9475e-05 deg
tp 2460124.002537038701
(2023-Jun-28.50253704)
0.00021831 TDB
period 1583.409343578058
4.34
8.348e-06
2.286e-08
d
yr
n .2273575064212402 1.1987e-09 deg/d
Q 2.719394724000714 9.5581e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2492  
   data-arc span      12985 days (35.55 yr)  
   first obs. used      1985-08-14  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46462  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 15:34:36  

Additional Information
 Earth MOID = 1.58902 au 
 Jupiter MOID = 2.25017 au 
 T_jup = 3.383 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.48   n/a MPCxxxxx  
diameter diameter 6.175 km 0.137 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.202   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7771 Tvären           Discovered 1992 Mar. 2 at the European Southern Observatory in the course of the Uppsala-ESO Survey of Asteroids and Comets.
Tvären is a kilometer-sized bay close to Studsvik in Sweden. The maximum depth is 85 meters, and it constitutes an Ordovician impact crater.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000320/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1992 EZ9 = 1985 PO1 = 1989 OY = 1992 EV3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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