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
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 ]  
21459 Chrisrussell (1998 HS51)
Classification: Main-belt Asteroid          SPK-ID: 2021459
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1319048372610228 2.8191e-08  
a 2.261876523195385 7.0064e-09 au
q 1.96352406849877 6.3092e-08 au
i 7.05346565228163 4.0094e-06 deg
node 46.82198818117722 3.0572e-05 deg
peri 240.9699330098391 3.5541e-05 deg
M 118.2140538173575 1.7471e-05 deg
tp 2458592.492284300150
6.0611e-05 TDB
period 1242.515360135455
n .2897348487995786 1.3462e-09 deg/d
Q 2.560228977892001 7.9306e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1793  
   data-arc span      25514 days (69.85 yr)  
   first obs. used      1950-03-21  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50913  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 23:24:42  

Additional Information
 Earth MOID = .958758 au 
 Jupiter MOID = 2.58582 au 
 T_jup = 3.598 
[ 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 14.4   n/a MPO502326  
diameter diameter 3.529 km 0.697 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 1.00 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Erasmus, N.; McNeill, A.; Mommert, M.; Trilling, D.E.; et al. (2018) Ap. J. Suppl. Series 237, A19.]
[Erasmus, N.; McNeill, A.; Mommert, N.; Trilling, D.E.; et al. (2019) Ap. J. Suppl. Series 242, A15.]
geometric albedo albedo 0.270   0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

21459 Chrisrussell           Discovered 1998 Apr. 30 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Christopher T. Russell (b. 1943) is a professor of geophysics and planetary physics at the University of California, Los Angeles. Principal Investigator of the Dawn mission to (1) Ceres and (4) Vesta, Russell has wide-ranging interests that include space physics, Venus, Jupiter, Jupiter I (Io) and Mercury.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

Alternate Designations
 1998 HS51 = 1992 SL24 = 1999 VB214 = 1999 XC24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Feb-26 02:21 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin