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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 ]

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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2039039532325345 3.9889e-08  
a 2.739836532493444 1.0264e-08 au
q 2.181173032307111 1.0965e-07 au
i 17.2990401150193 4.7057e-06 deg
node 72.76329440014617 1.4051e-05 deg
peri 127.0394532062972 1.7656e-05 deg
M 51.41037272868557 1.0942e-05 deg
tp 2458763.944169421442
(2019-Oct-07.44416942)
4.9888e-05 TDB
period 1656.476980972439
4.54
9.3079e-06
2.548e-08
d
yr
n .2173287067283368 1.2212e-09 deg/d
Q 3.298500032679777 1.2356e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      32048 days (87.74 yr)  
   first obs. used      1933-02-18  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38562  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:00:55  

Additional Information
 Earth MOID = 1.21822 au 
 Jupiter MOID = 1.82456 au 
 T_jup = 3.256 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456756.5 (2014-Apr-09.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2043588654946055 3.9788e-08  
q 2.179818361603863 1.0959e-07 au
tp 2457106.396581454554
(2015-Mar-24.89658145)
4.7277e-05 TDB
node 72.82116408282855 1.404e-05 deg
peri 126.596327517268 1.7646e-05 deg
i 17.30825593631997 4.7077e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2418  
   data-arc span      32048 days (87.74 yr)  
   first obs. used      1933-02-18  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38562  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:00:55  

Additional Information
 Jupiter MOID = 1.82456 au 
 T_jup = 3.256 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.583114194143648E-15 -4.347862425469039E-15 1.612052322667557E-13 -3.527978533533531E-15 7.789885606782008E-14 -2.650661801331682E-15
q -4.347862425469039E-15 1.201010822877294E-14 -3.665053733832962E-13 1.07776982189084E-14 -2.027828899523247E-13 7.458389163921502E-15
tp 1.612052322667557E-13 -3.665053733832962E-13 2.235139372050058E-9 -9.559775792948701E-12 5.200371506233385E-10 3.706430023907983E-12
node -3.527978533533531E-15 1.07776982189084E-14 -9.559775792948701E-12 1.971139676448916E-10 -1.899219862969571E-10 -5.777691211979317E-12
peri 7.789885606782008E-14 -2.027828899523247E-13 5.200371506233385E-10 -1.899219862969571E-10 3.113913501876021E-10 6.187388143053469E-12
i -2.650661801331682E-15 7.458389163921502E-15 3.706430023907983E-12 -5.777691211979317E-12 6.187388143053469E-12 2.216212607573324E-11

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 10.9   n/a MPO384761  
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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