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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 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 
[ 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 10.9   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1940-Nov-03 17:15 00:01 Jupiter 1.82200116218325 1.82200069789515 1.82200162647373 3.90978435627562 3.78901597515355 2429937.218492786 1.17797102334978 193.519297047646 17.3421973094882 -86.6872557627744 2335940.44485657 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01
1999-May-26 12:38 < 00:01 Jupiter 1.90324349929024 1.90324296913873 1.90324402944176 2.85355916042424 2.69308683468888 2451325.026657846 0.366961476037562 181.338009617833 24.5498600988146 -84.6673875810127 2275966.66576831 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01
2036-Mar-03 07:11 < 00:01 Jupiter 1.88546954525583 1.88546910756985 1.8854699829432 4.38772389665945 4.28411568117746 2464755.799357072 0.376829919467111 123.53201077867 13.0798799224837 -82.6264692654811 3112602.79172858 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01
2094-Oct-08 21:03 00:01 Jupiter 1.81876352860876 1.81876300616821 1.81876405104952 3.67460146179982 3.54559855835871 2486159.377089449 1.3144859406155 157.970909362949 27.8412064183653 87.8521145253081 2121086.37690311 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01
2153-Apr-15 00:53 00:03 Jupiter 1.99364294614697 1.99364133424596 1.99364455819599 2.41372229300113 2.23076935680584 2507531.536823353 2.75289020254175 1028.53825778498 42.6592163401499 -81.4469679871337 2417874.38386185 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01
2190-Feb-08 04:21 00:03 Jupiter 1.8104182706757 1.81041755728114 1.81041898409743 4.18463070473708 4.07129142753419 2520979.681151545 2.70116141873477 409.428882704581 15.532637642461 -86.3725889946062 2590881.1746869 T 37 CATAB v2.0f-lin.ifort 2020-Dec-18 02:01:00 2020-Dec-18 02:01

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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