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18695 (1998 HH27)
Classification: Main-belt Asteroid          SPK-ID: 2018695
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08571167126890934 3.6121e-08  
a 2.777735794384883 1.4486e-08 au
q 2.539651417104683 1.0313e-07 au
i 4.587421518435668 4.2651e-06 deg
node 123.8565932098865 5.661e-05 deg
peri 296.9128543412283 6.3712e-05 deg
M 356.1435416646599 2.8002e-05 deg
tp 2458618.614275666678
(2019-May-15.11427567)
0.00013153 TDB
period 1690.965822253367
4.63
1.3228e-05
3.622e-08
d
yr
n .2128960829736151 1.6654e-09 deg/d
Q 3.015820171665083 1.5728e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1342  
   data-arc span      10694 days (29.28 yr)  
   first obs. used      1990-08-24  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52163  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:30:44  

Additional Information
 Earth MOID = 1.55625 au 
 Jupiter MOID = 2.23584 au 
 T_jup = 3.324 
[ 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 14.3   n/a MPO324481  
diameter diameter 4.642 km 0.235 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.142   0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18695 (1998 HH27)          Discovered 1998-Apr-21 by Spacewatch at Kitt Peak
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HH27 = 1990 QP16 = 1997 EW34 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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