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4799 Hirasawa (1989 TC1)
Classification: Main-belt Asteroid          SPK-ID: 2004799
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279143213346195 2.0437e-08  
a 2.470369730555567 7.5503e-09 au
q 2.154374063025965 5.023e-08 au
i .6164860483944549 1.2575e-06 deg
node 241.5343998530651 0.00010364 deg
peri 82.07397210618797 9.8823e-05 deg
M 105.7403571203036 8.8605e-06 deg
tp 2458979.938014352254
(2020-May-10.43801435)
3.4803e-05 TDB
period 1418.21267600385
3.88
6.5018e-06
1.78e-08
d
yr
n .2538406305987796 1.1637e-09 deg/d
Q 2.78636539808517 8.5161e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2640  
   data-arc span      15919 days (43.58 yr)  
   first obs. used      1977-08-18  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43621  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:31:46  

Additional Information
 Earth MOID = 1.14147 au 
 Jupiter MOID = 2.49896 au 
 T_jup = 3.473 
[ 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 13.87   n/a MPCxxxxx  
diameter diameter 7.863 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 24. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.104   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4799 Hirasawa (1989 TC1)          Discovered 1989-Oct-08 by Mizuno and Furuta at Kani
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 TC1 = 1977 QM4 = 1985 TT2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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