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
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 ]  
1864 Daedalus (1971 FA)
Classification: Apollo [NEO]          SPK-ID: 2001864
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 486 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6143760823985353 3.441e-08  
a 1.461087900043092 3.4169e-09 au
q .5634304399747144 5.0419e-08 au
i 22.20872767257582 4.7248e-06 deg
node 6.633253426703948 7.7898e-06 deg
peri 325.6260357146135 7.4165e-06 deg
M 357.9815269289194 5.6025e-06 deg
tp 2458604.116874187290
1.0045e-05 TDB
period 645.0790580660123
n .558071131745158 1.9576e-09 deg/d
Q 2.358745360111469 5.5161e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2286  
   # delay obs. used      1  
   # Doppler obs. used      0  
   data-arc span      17819 days (48.79 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4078  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-18 05:01:04  

Additional Information
 Earth MOID = .269151 au 
 Jupiter MOID = 3.11569 au 
 T_jup = 4.335 
[ 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 14.7   n/a MPO502171  
diameter diameter 3.7 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543 based on assumed medium albedo (0.15)
rotation period rot_per 8.572 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Gehrels, T.; Roemer, E.; Marsden, B.G. (1971) Astron. J. 76, 607-608.]
[Pravec, P.; Wolf, M.; Varady, M.; Barta, P. (1995) Earth, Moon, and Planets 71, 177-187.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2001)]
[Warner, B.D. (2015) Minor Planet Bull. 42, 172-183.]
[Warner, B.D. (2018) Minor Planet Bull. 45, 138-147.]
geometric albedo albedo 0.273   0.055 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (  
B-V BV 0.830   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=22.99 deg.
U-B UB 0.500   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=22.99 deg.
Tholen spectral type spec_T SQ   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B Sr   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)

1864 Daedalus (1971 FA)          Discovered 1971-Mar-24 by Gehrels, T. at Palomar
First measurement Mar. 26.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Jan-20 12:23 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin