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 ]  
981 Martina (A917 SW)
Classification: Main-belt Asteroid          SPK-ID: 2000981
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2033069911230543 3.822e-08  
a 3.098423056022232 1.2377e-08 au
q 2.468491987276054 1.2106e-07 au
i 2.063271474680274 3.813e-06 deg
node 46.06191095209531 0.00010828 deg
peri 297.909944399046 0.00010861 deg
M 309.5468061558508 1.1209e-05 deg
tp 2459279.687302915947
(2021-Mar-06.18730292)
6.3007e-05 TDB
period 1992.092499836781
5.45
1.1936e-05
3.268e-08
d
yr
n .1807144999690004 1.0828e-09 deg/d
Q 3.728354124768411 1.4893e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3056  
   data-arc span      41571 days (113.82 yr)  
   first obs. used      1906-08-24  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43646  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:23:56  

Additional Information
 Earth MOID = 1.46179 au 
 Jupiter MOID = 1.68818 au 
 T_jup = 3.189 
[ 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 10.9   n/a MPO473776 IRAS observations used: 6
diameter diameter 32.545 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.267 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:
[Higgins, D.J. (2004) Minor Planet Bull. 32, 13-14.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.106   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.620   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.76 deg.
U-B UB 0.330   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=13.76 deg.
Tholen spectral type spec_T CFU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

981 Martina (A917 SW)          Discovered 1917-Sep-23 by Belyavskij, S. at Simeis
Discovered at Simeis during the First World War while Simeis was not in communication with the Rechen-Institut for long periods of time were given provisional designations containing the Greek letter SIGMA. These are here abbreviated S.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 SW = 1928 TG = 1942 EY = 1949 MF = 1953 FG = 1959 GF = 1959 JF = 1966 QA = A906 SD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Sep-26 06:45 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin