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 ]  
91608 (1999 TW21)
Classification: Main-belt Asteroid          SPK-ID: 2091608
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 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1606915113900994 5.1243e-08  
a 3.07403932166971 2.2506e-08 au
q 2.580067296998009 1.6119e-07 au
i 5.821371167793902 5.4527e-06 deg
node 23.39534193708779 5.8411e-05 deg
peri 65.01941198074992 6.2035e-05 deg
M 239.5805943487741 2.194e-05 deg
tp 2459659.001143086896
(2022-Mar-20.50114309)
0.0001226 TDB
period 1968.622999169149
5.39
2.1619e-05
5.919e-08
d
yr
n .1828689394322512 2.0082e-09 deg/d
Q 3.568011346341412 2.6122e-08 au
  Orbit Determination Parameters
   # obs. used (total)      534  
   data-arc span      7682 days (21.03 yr)  
   first obs. used      1999-09-30  
   last obs. used      2020-10-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55222  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:39:14  

Additional Information
 Earth MOID = 1.6031 au 
 Jupiter MOID = 1.6921 au 
 T_jup = 3.202 
[ 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 15.0   n/a MPO432453  
diameter diameter 5.422 km 0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.072   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91608 (1999 TW21)          Discovered 1999-Oct-03 by Spacewatch at Kitt Peak
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 TW21 = 2000 YK30 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Dec-05 09:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin