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 ]  
C/2021 A4 (NEOWISE)
Classification: Comet          SPK-ID: 1003756
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | 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.


Orbital Elements at Epoch 2459258.5 (2021-Feb-13.0) TDB
Reference: JPL 5 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .9733110922103525 9.7649e-05  
a 42.91993888955515 0.15758 au
q 1.145486291360643 1.4685e-05 au
i 111.57040598 0.00087214 deg
node 307.0844451465205 0.00046473 deg
peri 204.663951216314 0.0025745 deg
M 359.8771928699886 0.00068542 deg
tp 2459293.535486348895
(2021-Mar-20.03548635)
0.0025876 TDB
period 102703.9316400486
281.19
565.63
1.549
d
yr
n .003505221214526718 1.9305e-05 deg/d
Q 84.69439148774966 0.31096 au
  Orbit Determination Parameters
   # obs. used (total)      637  
   data-arc span      79 days  
   first obs. used      2021-01-03  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      5  
   norm. resid. RMS      .57811  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:34:17  

Additional Information
 Earth MOID = .20878 au 
 Jupiter MOID = 2.33851 au 
 T_jup = -0.363 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 13.7   0.6 5 2 parameter fit from 526 observations, autocmod 2.9c
comet total magnitude slope K1 28.   n/a 5 autocmod 2.9c
comet nuclear magnitude M2 17.5   0.3 5 from 47 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 5 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 5 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2021.2   C/2021 A4       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Apr-23 00:48 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin