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30281 Horstman (2000 HH57)
Classification: Main-belt Asteroid          SPK-ID: 2030281
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2007343234934955 3.7444e-08  
a 2.326053867051794 7.8301e-09 au
q 1.859135017639723 8.8594e-08 au
i 7.47777467255985 4.2203e-06 deg
node 165.1196435186988 2.4582e-05 deg
peri 212.3195762763732 2.6087e-05 deg
M 151.2412071825965 9.8003e-06 deg
tp 2458656.128082453256
(2019-Jun-21.62808245)
3.3971e-05 TDB
period 1295.770471338704
3.55
6.5428e-06
1.791e-08
d
yr
n .2778269824501185 1.4029e-09 deg/d
Q 2.792972716463865 9.4018e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1490  
   data-arc span      23844 days (65.28 yr)  
   first obs. used      1955-12-11  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50474  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:28:12  

Additional Information
 Earth MOID = .863361 au 
 Jupiter MOID = 2.67658 au 
 T_jup = 3.536 
[ 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 14.64   n/a E2021B10  
diameter diameter 2.514 km 0.442 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.326   0.126 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30281 Horstman           Discovered 2000 Apr. 24 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Helen Horstman (b. 1936) is a long-time employee of Lowell Observatory, starting in 1964 and retiring in 2007. Helen served as observatory secretary, cataloged images from the Planetary Patrol, and became executive secretary to the director. Since retiring, she has volunteered in the library.
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 2017-03-12Last Updated: 2017-04-19

Alternate Designations
 2000 HH57 = 1976 SN6 = 1999 CA60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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