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

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
4830 Thomascooley (1988 RG4)
Classification: Main-belt Asteroid          SPK-ID: 2004830
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.

Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06764801147332199 9.8033e-09  
a 2.393008010855862 7.3112e-09 au
q 2.231125777481733 2.6147e-08 au
i 6.415383377119569 4.3341e-07 deg
node 119.5465668203096 6.5615e-06 deg
peri 84.37973285563926 1.5975e-05 deg
M 74.75005671488901 1.6927e-05 deg
tp 2459115.747468246361
6.3464e-05 TDB
period 1352.11819058297
n .2662489141165868 1.2202e-09 deg/d
Q 2.55489024422999 7.8058e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2715  
   data-arc span      16544 days (45.30 yr)  
   first obs. used      1976-04-23  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43291  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 10:53:08  

Additional Information
 Earth MOID = 1.23904 au 
 Jupiter MOID = 2.41932 au 
 T_jup = 3.519 
[ 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 13.20   n/a MPO614063  
diameter diameter 5.742 km 0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 32.6173 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.371   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4830 Thomascooley           Discovered 1988 Sept. 1 by H. Debehogne at the European Southern Observatory.
Thomas Benton Cooley (1871--1945) was an American hematologist and professor of hygiene and medicine at the University of Michigan and Wayne State University. He is remembered for his discovery of a form of childhood anemia that became known as Cooley's anemia, a severe form of thalassemia.
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 2014-10-08Last Updated: 2015-01-12

Alternate Designations
 1988 RG4 = 1976 HE = 1983 CU = 1985 VW4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2021-Sep-20 17:36 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin