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18577 (1997 XH)
Classification: Main-belt Asteroid          SPK-ID: 2018577
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1423972243626583 1.1429e-08  
a 2.228142111937714 6.7573e-09 au
q 1.910860859712232 2.5465e-08 au
i 5.619550123313953 7.9691e-07 deg
node 319.12171454617 5.839e-06 deg
peri 273.4638400897383 7.3352e-06 deg
M 238.5354346236253 5.9582e-06 deg
tp 2459610.382953505618
(2022-Jan-30.88295351)
2.1253e-05 TDB
period 1214.822304799708
3.33
5.5263e-06
1.513e-08
d
yr
n .2963396363218358 1.3481e-09 deg/d
Q 2.545423364163196 7.7196e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1941  
   data-arc span      15147 days (41.47 yr)  
   first obs. used      1979-09-21  
   last obs. used      2021-03-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46633  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:32:10  

Additional Information
 Earth MOID = .908721 au 
 Jupiter MOID = 2.47748 au 
 T_jup = 3.624 
[ 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 14.4   n/a MPO337415  
diameter diameter 3.240 km 0.616 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 7.035 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 0.331   0.128 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

18577 (1997 XH)          Discovered 1997-Dec-03 by ODAS at Caussols
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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