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
JPL Small-Body Database Browser
Search: [ help ]  
2804 Yrjo (1941 HF)
Classification: Main-belt Asteroid          SPK-ID: 2002804
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07802385035408675 3.6594e-08  
a 3.013704322664682 1.4619e-08 au
q 2.778563507581628 1.1509e-07 au
i 11.23181217098843 3.8584e-06 deg
node 109.163583319737 2.0476e-05 deg
peri 174.1688951824299 3.4952e-05 deg
M 332.047396175335 2.6899e-05 deg
tp 2459148.877878376434
(2020-Oct-26.37787838)
0.0001425 TDB
period 1910.950283936785
5.23
1.3905e-05
3.807e-08
d
yr
n .18838794657617 1.3708e-09 deg/d
Q 3.248845137747735 1.576e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2531  
   data-arc span      29052 days (79.54 yr)  
   first obs. used      1941-04-03  
   last obs. used      2020-10-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42135  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:05:55  

Additional Information
 Earth MOID = 1.76236 au 
 Jupiter MOID = 1.90516 au 
 T_jup = 3.215 
[ 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 11.3   n/a MPO445284  
diameter diameter 17.605 km 0.194 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 8.12 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
geometric albedo albedo 0.220   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2804 Yrjo (1941 HF)          Discovered 1941-Apr-19 by Oterma, L. at Turku
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
1918-Jun-04 08:34 00:02 Jupiter 1.90945311461415 1.90945273549908 1.90945349372944 3.50839792774021 3.37959574822422 2421748.856964752 2.02689485351724 93.0125951127646 15.1191537977779 -86.7629561647099 3127398.18876346 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
1965-Mar-22 13:14 00:01 Jupiter 1.91668589138454 1.91668549616034 1.91668628660873 3.19967733841372 3.05844639538133 2438842.051650047 1.07282304329377 79.8803123555604 16.3146028765761 -85.1473349443666 3391962.22215716 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
2011-Dec-30 08:20 < 00:01 Jupiter 1.96813276283813 1.96813233851349 1.96813318716265 3.0574997446577 2.91334301360992 2455925.847391648 0.216523182372376 70.8050393537566 16.4002050023401 -89.1617670335136 3449634.44350409 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
2049-Aug-14 04:52 < 00:01 Jupiter 1.96097094460816 1.96097052442336 1.9609713647933 3.81452130407813 3.699552951212 2469667.702621376 0.780118801773441 71.7004000490365 13.6205410589867 -79.647808141426 3880114.82962731 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
2096-Jun-10 16:29 00:02 Jupiter 1.90651844448453 1.90651806590011 1.90651882306928 3.5888269198608 3.46282029984808 2486770.186982843 1.77524991235832 96.465951659008 14.7791573093663 -86.2680266864356 3324906.19220208 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
2143-Apr-02 16:12 00:03 Jupiter 1.91096237157316 1.91096185745417 1.91096288569248 3.32840283209441 3.19245634370872 2503866.174965399 2.866223293955 85.4281231028622 23.1662467458413 -78.8676142697183 3373040.39336135 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06
2190-Jan-12 20:31 00:04 Jupiter 1.96520027798231 1.96519925636685 1.96520129961219 3.17126985455249 3.03231444923781 2520953.355068429 4.01786634647958 307.471200983176 18.5113130114171 -81.4506910855874 3483583.70617503 T 31 CATAB v2.0f-lin.ifort 2020-Nov-13 04:06:02 2020-Nov-13 04:06

Alternate Designations
 1941 HF = 1951 EK2 = 1979 QD = 1979 QJ8 = 1982 BY6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-28 12:01 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin