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85609 (1998 HZ8)
Classification: Main-belt Asteroid          SPK-ID: 2085609
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1811661689422833 4.0971e-08  
a 2.309798916778533 8.1593e-09 au
q 1.89134149599873 9.6957e-08 au
i 7.494259159001252 4.2461e-06 deg
node 66.76502790593159 2.9012e-05 deg
peri 338.3673308147468 3.0968e-05 deg
M 14.8436721217605 1.1432e-05 deg
tp 2459343.631311285205
(2021-May-09.13131129)
4.0566e-05 TDB
period 1282.211556628529
3.51
6.7941e-06
1.86e-08
d
yr
n .2807649004089394 1.4877e-09 deg/d
Q 2.728256337558336 9.6375e-09 au
  Orbit Determination Parameters
   # obs. used (total)      790  
   data-arc span      8683 days (23.77 yr)  
   first obs. used      1996-12-03  
   last obs. used      2020-09-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55326  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:13:54  

Additional Information
 Earth MOID = .902856 au 
 Jupiter MOID = 2.66142 au 
 T_jup = 3.552 
[ 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 16.26   n/a E2021B10  
diameter diameter 1.573 km 0.151 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 11.131 h n/a LCDB (Rev. 2020-October); 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:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.236   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

85609 (1998 HZ8)          Discovered 1998-Apr-17 by Spacewatch at Kitt Peak
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

Alternate Designations
 1998 HZ8 = 2003 UR278 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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