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18827 (1999 NA26)
Classification: Main-belt Asteroid          SPK-ID: 2018827
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1151894580278041 2.5103e-08  
a 3.054553705039962 1.8073e-08 au
q 2.702701319239587 7.9885e-08 au
i 15.20355853183559 1.2938e-06 deg
node 107.0253051277314 3.4037e-06 deg
peri 235.3357495234941 1.238e-05 deg
M 4.960555417721675 1.0385e-05 deg
tp 2459369.631224178908
(2021-Jun-04.13122418)
5.6189e-05 TDB
period 1949.934731307887
5.34
1.7306e-05
4.738e-08
d
yr
n .1846215641066796 1.6386e-09 deg/d
Q 3.406406090840336 2.0155e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2294  
   data-arc span      11661 days (31.93 yr)  
   first obs. used      1989-09-04  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:14:02  

Additional Information
 Earth MOID = 1.72322 au 
 Jupiter MOID = 1.97981 au 
 T_jup = 3.172 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456972.5 (2014-Nov-11.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1159153350358609 2.5047e-08  
q 2.698774815931133 7.956e-08 au
tp 2457429.973585301624
(2016-Feb-11.47358530)
5.5124e-05 TDB
node 107.062949843348 3.4012e-06 deg
peri 237.0725623860787 1.2413e-05 deg
i 15.21071415470247 1.2936e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2294  
   data-arc span      11661 days (31.93 yr)  
   first obs. used      1989-09-04  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:14:02  

Additional Information
 Jupiter MOID = 1.97981 au 
 T_jup = 3.172 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.273489057529537E-16 -1.954481560532994E-15 -1.881003323832847E-13 1.227909052234395E-14 -7.998356412700481E-15 -5.616614447885381E-15
q -1.954481560532994E-15 6.32980845138599E-15 5.151981552386972E-13 -3.835310276362826E-14 3.448653222116924E-15 1.843906713081018E-14
tp -1.881003323832847E-13 5.151981552386972E-13 3.038678169067476E-9 -2.626961994402101E-12 6.520663211012537E-10 1.670323249027315E-11
node 1.227909052234395E-14 -3.835310276362826E-14 -2.626961994402101E-12 1.156825825027656E-11 -1.123927269471632E-11 2.677789614597661E-12
peri -7.998356412700481E-15 3.448653222116924E-15 6.520663211012537E-10 -1.123927269471632E-11 1.540787423986812E-10 2.310579368635557E-13
i -5.616614447885381E-15 1.843906713081018E-14 1.670323249027315E-11 2.677789614597661E-12 2.310579368635557E-13 1.673310506525625E-12

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 12.26   n/a MPO636348  
diameter diameter 20.607 km 0.115 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.066   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18827 (1999 NA26)          Discovered 1999-Jul-14 by LINEAR at Socorro
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
1943-Feb-16 21:39 00:02 Jupiter 1.98478194138775 1.98478169296156 1.98478218981485 4.61013886678507 4.51662079706196 2430772.401971720 1.76359390484509 154.376180859474 10.1050083752987 -87.6045229225611 7932392.78358502 T 34 CATAB v2.0g-lin.ifort 2021-Aug-24 22:14:42 2021-Aug-24 22:14
2050-Jan-17 23:24 < 00:01 Jupiter 1.99218394796341 1.99218371989796 1.99218417602886 4.55001362903466 4.45558956146243 2469824.475145563 0.890620948953953 80.1663852299296 10.2591919305549 -88.4599669479397 7831318.35117363 T 34 CATAB v2.0g-lin.ifort 2021-Aug-24 22:14:42 2021-Aug-24 22:14

Alternate Designations
 1999 NA26 = 1989 RV5 = 1998 HE120 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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