Comet C/1997 BA6 Spacewatch

Nongravitational nominal solution


   Observational arc:        1997 01 11 - 2004 09 15  
   Number of observations:   529  
   RMS:                      0.67 arcsec (1054 residuals used, 0.4% rejected residuals ) 

Heliocentric osculating orbit

  Epoch        Perihelion time   q             e            ω              Ω            i      
  1999 12 08   19991127.566151   3.43630558    0.99882316   285.935698    317.663829    72.714861              
                    ± 0.000334   0.00000451    0.00000508     0.000033      0.000010     0.000022         

  NG parameters:   
   A1 = (3340.8   ± 117.7  )×10-8 AU/day2  
   A2 = (  24.282 ±  54.541)×10-8 AU/day2  
   A3 = ( -29.81  ±  11.72 )×10-8 AU/day2  

Barycentric nominal original orbit (at 250 AU from the Sun)

  Epoch        Perihelion time   q             e             ω             Ω            i      
  1697 02 13   19991128.142457   3.44037125    0.99989050    285.890502   318.382446    72.634463              
                    ± 0.000383   0.00000573    0.00000397      0.000150     0.000014     0.000027         
   1/aori =  (+31.83 ± 1.15)×10-6 AU-1  

Barycentric nominal future orbit (at 250 AU from the Sun)

  Epoch        Perihelion time   q             e             ω             Ω            i      
  2307 02 17   19991128.384619   3.43278727    0.99861836    285.870734   318.286367    72.679266              
                    ± 0.000418   0.00000591    0.00000589      0.000186     0.000012     0.000028         
   1/afut = (+402.48 ± 1.72)×10-6 AU-1  

In the 17th edition of the Catalogue of Cometary orbits (2008):

Gravitational orbit (418 obs.) with 1/aori = 0.000000 AU-1.


The same comet in some other internet sources:


More details

Starting swarms of VCs...(heliocentric, osculating orbits)


Gravitational osculating swarm.

Nongravitational osculating swarm.


Original and future orbit at the 250 AU from the Sun.

Comet number 18 in the Table: Nongravitational Oort spike comets (26 objects)

  Name

GR
(1/a)ori
[10-8 AU/day2]
GR
(1/a)osc
[10-8 AU/day2]

epoch [TT]
GR
1/afut
[10-8 AU/day2]
RMSGR

[arcsec]
NG
(1/a)ori
[10-8 AU/day2]
NG
(1/a)osc
[10-8 AU/day2]

epoch [TT]
NG
1/afut
[10-8 AU/day2]
RMSNG

[arcsec]
NG parameters
A1
A2
A3
[10-8 AU/day2]
tau shift [day]
18 C/1997 BA6 Spacewatch
weighting
+1.49 ± 0.35 +305.38 ± 0.35
1999 12 08
+371.77 ± 0.35 0.74 +31.83 ± 1.15 +342.47 ± 1.48
1999 12 08
+402.48 ± 1.72 0.67 3340.8 ± 117.7
24.3 ± 54.1
-29.8 ± 11.7


Note: in the following plots black denotes returning clones while red denotes escaping ones.The nominal solution is located at the center of the green circle. Each plot have a header where date of calculation and some other parameters are coded. Also numbers of returning (B=shown+omitted), escaping (C=shown+omitted) and all (T=shown+omitted) Vcs are shown.

Past orbits, at previous perihelion for the returning VCs :

1997baamz.png
Past, gravitational, all VCs at the escape border.


1997banmz.png
Past, nongravitational, asynchronous.
1997banmsz.png
Past, nongravitational, synchronous.


Future orbits, at next perihelion :

1997baapz.png
Future, gravitational, asynchronous.
1997baapsz.png
Future, gravitational, synchronous.


1997banpz.png
Future, nongravitational,asynchronous.
1997banpsz.png
Future, nongravitational, synchronous.