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7737 Sirrah (1981 VU)
Classification: Main-belt Asteroid          SPK-ID: 2007737
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .192825676842695 3.4092e-08  
a 2.435072332242018 7.3691e-09 au
q 1.965527861616531 8.3543e-08 au
i 1.98148921128268 4.2258e-06 deg
node 200.6148910879074 8.5271e-05 deg
peri 208.0528429914249 8.5893e-05 deg
M 99.22376051952475 8.9354e-06 deg
tp 2458817.957750048507
3.4453e-05 TDB
period 1387.925727280198
n .2593798738102953 1.1774e-09 deg/d
Q 2.904616802867505 8.79e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1765  
   data-arc span      16361 days (44.79 yr)  
   first obs. used      1976-05-29  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49905  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 19:59:30  

Additional Information
 Earth MOID = .975019 au 
 Jupiter MOID = 2.47684 au 
 T_jup = 3.479 
[ 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 14.59   n/a E2021B10  
rotation period rot_per 4.49 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Molnar, L.; Pal, A.; Sarneczky, K.; Szabo, R.; et al. (2018) Ap. J. Supp. Ser. 234, A37.]

7737 Sirrah           Discovered 1981 Nov. 5 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Alan William Harris (b. 1952), British astronomer, now at the DLR Institute of Planetary Exploration, Berlin. Harris has made both ground-based and space-based (ISO) radiometric observations of minor planets, concentrating especially on near-earth objects, and he has developed improved fitting techniques to relate observed fluxes to diameters and albedos. The name chosen is "Harris" spelled backwards, to distinguish from another Harris of the exact same name. Name suggested and citation prepared by the other A. W. Harris.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1981 VU = 1977 RX18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Apr-13 20:59 UT
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