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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08579972619039947 3.1984e-08  
a 2.777468264503704 1.2762e-08 au
q 2.539162247906762 8.844e-08 au
i 4.587893838708068 4.2257e-06 deg
node 123.8542772420393 4.6931e-05 deg
peri 296.7432767209546 5.5029e-05 deg
M 81.45294985652384 2.6936e-05 deg
tp 2458617.960398371038
(2019-May-14.46039837)
0.00012681 TDB
period 1690.72153714512
4.63
1.1653e-05
3.19e-08
d
yr
n .2129268434161432 1.4676e-09 deg/d
Q 3.015774281100646 1.3857e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1600  
   data-arc span      10838 days (29.67 yr)  
   first obs. used      1990-08-24  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50391  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:52:03  

Additional Information
 Earth MOID = 1.55608 au 
 Jupiter MOID = 2.23558 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 14.3   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1989-Dec-11 19:22 < 00:01 Inter 0.0485195161160221 0.0485185583267451 0.0485204741220583 6.5761595652712 6.57615951939051 2447872.306709562 0.491616291029161 211.700516230976 29.6515079410018 -79.7142374040718 240852.291013344 T 28 CATAB v2.0f-lin.ifort 2020-May-20 04:52:17 2020-May-20 04:52
2109-Oct-15 20:45 00:21 Cybel 0.0250904276294816 0.0250859502819297 0.0250949065269517 1.7703180151923 1.770317878244 2491644.364626106 20.7493813166779 384.604727394103 31.9375612621339 54.8756756833288 96049.9559027046 T 28 CATAB v2.0f-lin.ifort 2020-May-20 04:52:17 2020-May-20 04:52

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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