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1484 Postrema (1938 HC)
Classification: Main-belt Asteroid          SPK-ID: 2001484
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2051727964739255 1.2014e-08  
a 2.738389965825064 1.01e-08 au
q 2.176546838700598 3.2186e-08 au
i 17.28494593201207 4.8692e-07 deg
node 72.6592874811477 1.1934e-06 deg
peri 127.0027671100858 4.4061e-06 deg
M 137.5178908167704 4.1715e-06 deg
tp 2458764.236558422213
(2019-Oct-07.73655842)
1.6853e-05 TDB
period 1655.16528515754
4.53
9.1572e-06
2.507e-08
d
yr
n .2175009367513014 1.2033e-09 deg/d
Q 3.300233092949529 1.2172e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2576  
   data-arc span      32313 days (88.47 yr)  
   first obs. used      1933-02-18  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:45:24  

Additional Information
 Earth MOID = 1.2143 au 
 Jupiter MOID = 1.82082 au 
 T_jup = 3.256 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456949.5 (2014-Oct-19.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039436342709711 1.2034e-08  
q 2.180505873120175 3.2233e-08 au
tp 2457106.466064384129
(2015-Mar-24.96606438)
1.343e-05 TDB
node 72.79508471115955 1.192e-06 deg
peri 126.6097478174999 4.4202e-06 deg
i 17.3011724034448 4.8775e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2576  
   data-arc span      32313 days (88.47 yr)  
   first obs. used      1933-02-18  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38626  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:45:24  

Additional Information
 Jupiter MOID = 1.82082 au 
 T_jup = 3.256 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.4481025273776E-16 -3.765662739680803E-16 -8.370489365837417E-14 6.053733516204448E-15 -3.378204693907719E-14 3.042478480136194E-16
q -3.765662739680803E-16 1.038959199689615E-15 2.402869442021318E-13 -1.652806546227787E-14 9.584174281914269E-14 -8.61474109690123E-16
tp -8.370489365837417E-14 2.402869442021318E-13 1.803651441270868E-10 -2.54934708417571E-12 5.702177242922204E-11 -1.336227403546991E-12
node 6.053733516204448E-15 -1.652806546227787E-14 -2.54934708417571E-12 1.42076676042555E-12 -1.970281676088095E-12 2.086542847158042E-13
peri -3.378204693907719E-14 9.584174281914269E-14 5.702177242922204E-11 -1.970281676088095E-12 1.953818007797326E-11 -6.190277436626808E-13
i 3.042478480136194E-16 -8.61474109690123E-16 -1.336227403546991E-12 2.086542847158042E-13 -6.190277436626808E-13 2.378984709913099E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 10.99   n/a E2021B10  
diameter diameter 40.871 km 0.279 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.1923 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Julian, W.M. (2006) Minor Planet Bull. 33, 103-104.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.015   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B B   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1484 Postrema (1938 HC)          Discovered 1938-Apr-29 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1938 HC = 1933 DH = A911 KC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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