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 ]  
42918 (1999 SK4)
Classification: Main-belt Asteroid          SPK-ID: 2042918
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1156876765430426 3.1957e-08  
a 2.379995311098988 8.5759e-09 au
q 2.10465918337461 7.7577e-08 au
i 6.691697123465605 4.0768e-06 deg
node 187.8935856506565 3.0053e-05 deg
peri 154.9707893408267 3.5217e-05 deg
M 245.9037448752919 2.0106e-05 deg
tp 2459425.541630081139
(2021-Jul-30.04163008)
7.5932e-05 TDB
period 1341.10437421424
3.67
7.2486e-06
1.985e-08
d
yr
n .2684354826677274 1.4509e-09 deg/d
Q 2.655331438823365 9.568e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1446  
   data-arc span      9592 days (26.26 yr)  
   first obs. used      1994-03-16  
   last obs. used      2020-06-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50371  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 21:23:40  

Additional Information
 Earth MOID = 1.09939 au 
 Jupiter MOID = 2.72989 au 
 T_jup = 3.521 
[ 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 14.9   n/a MPO324694  
diameter diameter 2.260 km 0.271 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.393 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.456   0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

42918 (1999 SK4)          Discovered 1999-Sep-29 by Korlevic, K. at Visnjan
Reference: 20020624/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SK4 = 1998 HR74 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Oct-30 17:37 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin