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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2035254060109487 4.9451e-08  
a 2.738395302242979 1.1666e-08 au
q 2.181062286535502 1.3756e-07 au
i 17.30249653823509 5.0682e-06 deg
node 72.76437307012563 1.5277e-05 deg
peri 126.9348712243394 1.8768e-05 deg
M 324.524001032441 1.128e-05 deg
tp 2458763.607815524372
(2019-Oct-07.10781552)
5.2282e-05 TDB
period 1655.170123397214
4.53
1.0577e-05
2.896e-08
d
yr
n .2175003009727513 1.3899e-09 deg/d
Q 3.295728317950456 1.4041e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2106  
   data-arc span      31494 days (86.23 yr)  
   first obs. used      1933-02-18  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40044  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:23:27  

Additional Information
 Earth MOID = 1.21846 au 
 Jupiter MOID = 1.82795 au 
 T_jup = 3.256 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456447.5 (2013-Jun-04.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2051673822937776 4.9323e-08  
q 2.175597662379883 1.3733e-07 au
tp 2457106.564187036563
(2015-Mar-25.06418704)
4.8451e-05 TDB
node 72.8241865575695 1.5258e-05 deg
peri 126.8154974453984 1.8708e-05 deg
i 17.31969527312116 5.0731e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2106  
   data-arc span      31494 days (86.23 yr)  
   first obs. used      1933-02-18  
   last obs. used      2019-05-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40044  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:23:27  

Additional Information
 Jupiter MOID = 1.82795 au 
 T_jup = 3.256 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.43276521251759E-15 -6.75909651897961E-15 8.371271672550771E-14 -5.151936304275844E-15 1.199585078818362E-13 -4.747266834392003E-15
q -6.75909651897961E-15 1.886032141844827E-14 -1.290479113230226E-13 1.382457483428623E-14 -3.197114116666351E-13 1.372777487902259E-14
tp 8.371271672550771E-14 -1.290479113230226E-13 2.347502761718446E-9 -1.278550052702204E-11 5.348419940895123E-10 4.744176795559506E-12
node -5.151936304275844E-15 1.382457483428623E-14 -1.278550052702204E-11 2.328160470722078E-10 -2.245893881432658E-10 -1.360333967756547E-11
peri 1.199585078818362E-13 -3.197114116666351E-13 5.348419940895123E-10 -2.245893881432658E-10 3.499715037219647E-10 1.372520260301373E-11
i -4.747266834392003E-15 1.372777487902259E-14 4.744176795559506E-12 -1.360333967756547E-11 1.372520260301373E-11 2.573637270567478E-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. 2019-January); 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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