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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 ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0859066272119082 3.1977e-08  
a 2.776911396377461 1.2494e-08 au
q 2.538356304248363 8.8372e-08 au
i 4.587967669188336 4.1177e-06 deg
node 123.854834304035 4.6878e-05 deg
peri 296.6170037259282 5.4307e-05 deg
M 124.1653338657382 2.5934e-05 deg
tp 2458617.539242313681
(2019-May-14.03924231)
0.00012201 TDB
period 1690.213091151561
4.63
1.1407e-05
3.123e-08
d
yr
n .2129908955767986 1.4374e-09 deg/d
Q 3.015466488506559 1.3567e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1633  
   data-arc span      11161 days (30.56 yr)  
   first obs. used      1990-08-24  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50202  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:35:23  

Additional Information
 Earth MOID = 1.55458 au 
 Jupiter MOID = 2.23637 au 
 T_jup = 3.325 
[ 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 14.34   n/a E2021B10  
diameter diameter 4.642 km 0.235 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.35909 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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

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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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