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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2051727963475528 1.2042e-08  
a 2.738389965724859 1.0138e-08 au
q 2.17654683896701 3.2223e-08 au
i 17.28494593810619 4.8722e-07 deg
node 72.65928748942021 1.1935e-06 deg
peri 127.0027671501536 4.4224e-06 deg
M 137.5178908141784 4.1716e-06 deg
tp 2458764.236558468834
(2019-Oct-07.73655847)
1.6858e-05 TDB
period 1655.165285066691
4.53
9.1919e-06
2.517e-08
d
yr
n .2175009367632398 1.2079e-09 deg/d
Q 3.300233092482708 1.2218e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2518  
   data-arc span      32278 days (88.37 yr)  
   first obs. used      1933-02-18  
   last obs. used      2021-07-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38745  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 13:20:28  

Additional Information
 Earth MOID = 1.2143 au 
 Jupiter MOID = 1.82082 au 
 T_jup = 3.256 
[ show covariance matrix ]

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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