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 ]  
4151 Alanhale (1985 HV1)
Classification: Main-belt Asteroid          SPK-ID: 2004151
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1423211489415594 3.4724e-08  
a 3.151611958943982 1.5418e-08 au
q 2.703070923929116 1.0954e-07 au
i 1.006328087942706 3.9746e-06 deg
node 67.07927281868156 0.00022341 deg
peri 75.65151880565028 0.00022382 deg
M 91.70726905590568 1.4124e-05 deg
tp 2458079.906433777429
(2017-Nov-22.40643378)
7.9614e-05 TDB
period 2043.607728912703
5.60
1.4996e-05
4.106e-08
d
yr
n .1761590519094079 1.2926e-09 deg/d
Q 3.600152993958848 1.7612e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2293  
   data-arc span      18754 days (51.35 yr)  
   first obs. used      1968-04-17  
   last obs. used      2019-08-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48326  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 00:44:43  

Additional Information
 Earth MOID = 1.7164 au 
 Jupiter MOID = 1.41757 au 
 T_jup = 3.191 
[ 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 12.3   n/a MPO328710  
diameter diameter 19.526 km 0.269 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.918 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.045   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4151 Alanhale (1985 HV1)          Discovered 1985-Apr-24 by Shoemaker, C. and E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1985 HV1 = 1968 HD = 1976 SO1 = 1979 FX1 = 1982 SZ4 = 1985 JX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2019-Oct-22 07:08 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin