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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
21028 (1989 TO)
Classification: Mars-crossing Asteroid          SPK-ID: 2021028
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2997698472229112 3.5769e-08  
a 2.33295780685296 8.0489e-09 au
q 1.63360740151515 8.2725e-08 au
i 21.78482807928717 6.9499e-06 deg
node 340.5573540149445 1.141e-05 deg
peri 98.55475755296376 1.6103e-05 deg
M 69.60137025174481 1.1033e-05 deg
tp 2458348.863264546687
(2018-Aug-18.36326455)
3.9309e-05 TDB
period 1301.543697136072
3.56
6.7356e-06
1.844e-08
d
yr
n .2765946320451224 1.4314e-09 deg/d
Q 3.032308212190769 1.0462e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1215  
   data-arc span      10811 days (29.60 yr)  
   first obs. used      1989-10-04  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39264  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:57:42  

Additional Information
 Earth MOID = .79484 au 
 Jupiter MOID = 2.522 au 
 T_jup = 3.417 
[ 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 13.3   n/a MPO431742  
diameter diameter 5.746 km 1.628 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 3.6644 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2007) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D.; Husarik, M.; Pravec, P. (2008) Minor Planet Bull. 35, 75-76.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2014) http://www.asu.cas.cz/~ppravec/neo.htm]
[Stephens, R.D.; Warner, B.D. (2015) Minor Planet Bull. 42, 96-100.]
geometric albedo albedo 0.248   0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

21028 (1989 TO)          Discovered 1989-Oct-04 by Helin, E. F. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 TO = 1994 CY2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Dec-12 13:50 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin