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17845 (1998 HY112)
Classification: Main-belt Asteroid          SPK-ID: 2017845
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1322532430173055 9.1797e-09  
a 2.86403016283578 1.0435e-08 au
q 2.485252885701366 2.4782e-08 au
i 13.67359782347286 5.4002e-07 deg
node 76.8632304005954 4.0799e-06 deg
peri 313.0802834770137 1.2646e-05 deg
M 63.7405953521482 9.8746e-06 deg
tp 2458887.042675127847
(2020-Feb-07.54267513)
4.8181e-05 TDB
period 1770.373124545533
4.85
9.6758e-06
2.649e-08
d
yr
n .2033469639867102 1.1114e-09 deg/d
Q 3.242807439970193 1.1815e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2263  
   data-arc span      18042 days (49.40 yr)  
   first obs. used      1971-10-22  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42294  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:15:09  

Additional Information
 Earth MOID = 1.51312 au 
 Jupiter MOID = 2.20275 au 
 T_jup = 3.246 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.14   n/a E2021B10  
diameter diameter 10.144 km 0.535 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 6.6 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:
[Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.130   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

17845 (1998 HY112)          Discovered 1998-Apr-23 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1998 HY112 = 1971 UG4 = 1976 YU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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