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 ]  
31189 Tricomi (1997 YZ7)
Classification: Main-belt Asteroid          SPK-ID: 2031189
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1928638325699776 8.8427e-08  
a 2.53368074759842 1.1273e-08 au
q 2.045025368107822 2.2605e-07 au
i 10.48927402764916 8.645e-06 deg
node 280.84015265 2.7313e-05 deg
peri 149.4830439482378 3.1039e-05 deg
M 125.7175284419598 1.2714e-05 deg
tp 2458086.077924141127
5.1152e-05 TDB
period 1473.079765441716
n .2443859514233779 1.631e-09 deg/d
Q 3.022336127089017 1.3447e-08 au
  Orbit Determination Parameters
   # obs. used (total)      682  
   data-arc span      7825 days (21.42 yr)  
   first obs. used      1997-12-05  
   last obs. used      2019-05-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52997  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 03:38:43  

Additional Information
 Earth MOID = 1.06705 au 
 Jupiter MOID = 2.26963 au 
 T_jup = 3.400 
[ 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 MPO279840  
diameter diameter 3.134 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 4.896 h n/a LCDB (Rev. 2019-January); 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 0.237   0.092 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

31189 Tricomi           Discovered 1997 Dec. 27 by P. G. Comba at Prescott.
Francesco Giacomo Tricomi (1897-1978) was a professor in Torino and a prolific researcher in classical mathematical analysis. In the 1920s he solved a partial differential equation with mixed (elliptic/hyperbolic) boundary conditions. In the 1940s Tricomi's equation became the basic tool for modeling transonic flow.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020328/MPCPages.arcLast Updated: 2003-10-02
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2019-Dec-08 16:11 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin