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3172 Hirst (1981 WW)
Classification: Main-belt Asteroid          SPK-ID: 2003172
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2215059974434137 9.066e-09  
a 2.426771330176976 7.9388e-09 au
q 1.889226926119045 2.0862e-08 au
i 3.650617946976431 5.2575e-07 deg
node 83.34200761673898 7.9707e-06 deg
peri 271.3342123706944 7.8094e-06 deg
M 162.3733939074901 3.6333e-06 deg
tp 2458577.692150126805
(2019-Apr-04.19215013)
1.2001e-05 TDB
period 1380.834757214541
3.78
6.7758e-06
1.855e-08
d
yr
n .2607118615164368 1.2793e-09 deg/d
Q 2.964315734234906 9.6973e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2724  
   data-arc span      24365 days (66.71 yr)  
   first obs. used      1954-07-09  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4457  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:47:20  

Additional Information
 Earth MOID = .887097 au 
 Jupiter MOID = 2.48378 au 
 T_jup = 3.473 
[ 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 13.21   n/a MPCxxxxx  
diameter diameter 5.618 km 0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.387   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

3172 Hirst (1981 WW)          Discovered 1981-Nov-24 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 WW = 1954 NW = 1977 TC3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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