Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
21946 (1999 VD138)
Classification: Main-belt Asteroid          SPK-ID: 2021946
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2026815625035175 1.3695e-08  
a 2.358773189395404 7.1003e-09 au
q 1.880693353777338 3.0975e-08 au
i 7.411520492709291 4.2843e-07 deg
node 325.3817008313622 6.9783e-06 deg
peri 241.7066018714039 7.7399e-06 deg
M 123.8267803448959 4.552e-06 deg
tp 2458745.365474730689
(2019-Sep-18.86547473)
1.5714e-05 TDB
period 1323.206729922101
3.62
5.9746e-06
1.636e-08
d
yr
n .2720663308757458 1.2284e-09 deg/d
Q 2.83685302501347 8.5394e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2129  
   data-arc span      10729 days (29.37 yr)  
   first obs. used      1991-09-04  
   last obs. used      2021-01-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4524  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:09  

Additional Information
 Earth MOID = .889682 au 
 Jupiter MOID = 2.17713 au 
 T_jup = 3.514 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.21   n/a E2021B10  
diameter diameter 4.725 km 0.511 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 2.141 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.115   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21946 (1999 VD138)          Discovered 1999-Nov-09 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 VD138 = 1991 RA39 = 1999 RD242 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-16 12:42 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin