Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 
[ 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. 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

[ 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 1.82200104415393 1.8220005425345 1.82200154577575 3.90978403232265 3.78901563292707 2429937.218454036 1.29006481361542 203.927047848605 19.8972287995592 -86.7780254527177 2153875.9723225 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23
1999-May-26 12:38 < 00:01 Jupiter 1.90324345789959 1.90324288156798 1.90324403423141 2.85355903730701 2.69308670064166 2451325.026656399 0.385392294572149 211.439266300944 25.2364463134432 -84.4168739023234 1975478.21071858 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23
2036-Mar-03 07:11 < 00:01 Jupiter 1.88546943702811 1.88546893008371 1.88546994397464 4.38772376176389 4.28411553700043 2464755.799385631 0.433941455270209 143.13880785961 13.7541207222839 -82.201239916561 2781943.63339624 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23
2094-Oct-08 21:03 00:01 Jupiter 1.81876342409387 1.81876287347914 1.81876397470859 3.67460162594457 3.54559872092771 2486159.377157872 1.48492885885716 191.974342916778 29.656248181864 88.7563608461942 1890382.29159929 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23
2153-Apr-15 00:53 00:03 Jupiter 1.9936428497669 1.99364109141239 1.99364460829491 2.4137228113634 2.23076990847342 2507531.536940413 3.09759976762107 1117.34694145552 49.9948945872995 -81.2508748971661 2034813.68523727 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23
2190-Feb-08 04:21 00:03 Jupiter 1.81041819255889 1.81041733305049 1.81041905210558 4.18463081304848 4.07129153390233 2520979.681270163 3.03293800832887 472.653502456619 17.0495566220205 -86.0664784120112 2372503.88820423 T 30 CATAB v2.0e-lin.ifort 2019-May-29 19:23:35 2019-May-29 19:23

Alternate Designations
 1938 HC = 1933 DH = A911 KC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-20 15:20 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin