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21918 (1999 VN45)
Classification: Main-belt Asteroid          SPK-ID: 2021918
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2613916834104471 4.3566e-08  
a 2.741227231788803 1.208e-08 au
q 2.024693231060968 1.1937e-07 au
i 17.50885915367187 6.7522e-06 deg
node 23.25208311444114 1.2308e-05 deg
peri 113.6191138021372 1.7115e-05 deg
M 207.5958556610203 1.1256e-05 deg
tp 2460098.294983240765
(2023-Jun-02.79498324)
5.2964e-05 TDB
period 1657.738344731201
4.54
1.0958e-05
3e-08
d
yr
n .217163342540872 1.4355e-09 deg/d
Q 3.457761232516638 1.5238e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1199  
   data-arc span      17213 days (47.13 yr)  
   first obs. used      1974-06-20  
   last obs. used      2021-08-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:19  

Additional Information
 Earth MOID = 1.10272 au 
 Jupiter MOID = 1.79047 au 
 T_jup = 3.234 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457412.5 (2016-Jan-25.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2615620715770636 4.247e-08  
q 2.02232133495675 1.1531e-07 au
tp 2456781.184561011557
(2014-May-03.68456101)
4.8935e-05 TDB
node 23.70142315075652 1.2367e-05 deg
peri 112.5883840271383 1.7255e-05 deg
i 17.49658642005596 6.7469e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1199  
   data-arc span      17213 days (47.13 yr)  
   first obs. used      1974-06-20  
   last obs. used      2021-08-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4883  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:19  

Additional Information
 Jupiter MOID = 1.79047 au 
 T_jup = 3.234 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.803719508980187E-15 -4.884200150877596E-15 1.264412041532028E-12 7.181810916059696E-15 3.146583340149893E-13 -4.60901769127424E-15
q -4.884200150877596E-15 1.329640983085745E-14 -3.443673044232787E-12 -1.941967823241695E-14 -8.502465535944464E-13 1.260774202231096E-14
tp 1.264412041532028E-12 -3.443673044232787E-12 2.394668930242178E-9 1.853476519560099E-12 5.971896161520671E-10 -2.468550517414875E-12
node 7.181810916059696E-15 -1.941967823241695E-14 1.853476519560099E-12 1.529309410666109E-10 -1.447772669906429E-10 -2.567760788027708E-11
peri 3.146583340149893E-13 -8.502465535944464E-13 5.971896161520671E-10 -1.447772669906429E-10 2.977301744051787E-10 2.398515999395921E-11
i -4.60901769127424E-15 1.260774202231096E-14 -2.468550517414875E-12 -2.567760788027708E-11 2.398515999395921E-11 4.552021891315767E-11

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 14.33   n/a MPCxxxxx  
diameter diameter 4.120 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.137   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21918 (1999 VN45)          Discovered 1999-Nov-04 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 VN45 = 1992 GN7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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