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JPL Small-Body Database Browser
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49636 (1999 HJ1)
Classification: Main-belt Asteroid          SPK-ID: 2049636
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2460467209257602 3.1894e-08  
a 2.276283383227744 9.6137e-09 au
q 1.716211320886762 7.1354e-08 au
i 22.35085567231134 6.0848e-06 deg
node 201.4906523757218 9.4832e-06 deg
peri 88.11997313203713 1.6659e-05 deg
M 233.0801995359627 1.634e-05 deg
tp 2459042.746901556507
(2020-Jul-12.24690156)
5.8689e-05 TDB
period 1254.405411750189
3.43
7.9468e-06
2.176e-08
d
yr
n .2869885577882799 1.8181e-09 deg/d
Q 2.836355445568726 1.1979e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1292  
   data-arc span      11897 days (32.57 yr)  
   first obs. used      1986-09-10  
   last obs. used      2019-04-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47388  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:51:29  

Additional Information
 Earth MOID = .863765 au 
 Jupiter MOID = 2.60088 au 
 T_jup = 3.472 
[ 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 14.0   n/a MPO365831  
diameter diameter 3.940 km 0.076 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.821 h n/a LCDB (Rev. 2019-January); 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:
[Oey, J. (2014) Minor Planet Bull. 41, 276-281.]
geometric albedo albedo 0.367   0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

49636 (1999 HJ1)          Discovered 1999-Apr-16 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 HJ1 = 2000 SA172 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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