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 ]  
7984 Marius (1980 SM)
Classification: Main-belt Asteroid          SPK-ID: 2007984
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1991822875065915 3.8158e-08  
a 2.633675512519416 1.26e-08 au
q 2.109093999385704 1.0183e-07 au
i 9.043288607248153 5.0922e-06 deg
node 340.2345673166967 2.1449e-05 deg
peri 28.76399937088367 2.4197e-05 deg
M 98.64016048607466 1.1396e-05 deg
tp 2458572.746969637112
4.8497e-05 TDB
period 1561.139906624332
n .2306007286550195 1.6549e-09 deg/d
Q 3.158257025653127 1.511e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1874  
   data-arc span      14361 days (39.32 yr)  
   first obs. used      1980-09-08  
   last obs. used      2020-01-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51982  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 21:04:17  

Additional Information
 Earth MOID = 1.11241 au 
 Jupiter MOID = 2.32737 au 
 T_jup = 3.353 
[ 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 13.6   n/a MPO502228  
diameter diameter 10.014 km 0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 3.534 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 0.065   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7984 Marius           Discovered 1980 Sept. 29 by Z. Vavrova at Klet.
Simon Marius (1573-1625) was court astronomer in Ansbach. He discovered the Jovian satellites, but published his observations after Galileo, who accused him of plagiarism and ruined his reputation. Marius suggested the names for the satellites and also measured the diameter of the Andromeda Galaxy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-03-16Last Updated: 2014-03-21

[ show close-approach data ]
Alternate Designations
 1980 SM = 1995 DJ12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-20 04:45 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin