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 ]  
30721 (1975 ST1)
Classification: Main-belt Asteroid          SPK-ID: 2030721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1141695367754479 4.8251e-08  
a 2.967613837701484 1.8835e-08 au
q 2.628802740522696 1.4475e-07 au
i 10.37338268883831 5.9204e-06 deg
node 187.4191712179507 2.3245e-05 deg
peri 157.9757484026196 3.2516e-05 deg
M 331.2134533962725 2.5129e-05 deg
tp 2459349.812640214204
(2021-May-15.31264021)
0.00013094 TDB
period 1867.280268698614
5.11
1.7777e-05
4.867e-08
d
yr
n .1927937685813492 1.8354e-09 deg/d
Q 3.306424934880272 2.0985e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1303  
   data-arc span      16443 days (45.02 yr)  
   first obs. used      1975-09-30  
   last obs. used      2020-10-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52799  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:39:26  

Additional Information
 Earth MOID = 1.62387 au 
 Jupiter MOID = 2.15811 au 
 T_jup = 3.229 
[ 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 13.93   n/a E2021B10  
diameter diameter 5.504 km 0.201 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.212   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30721 (1975 ST1)          Discovered 1975-Sep-30 by Bus, S. J. at Palomar
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1975 ST1 = 1999 JA72 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-20 14:28 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin