171P/Spahr (0171P)
Type: Periodic
Perihelion date: 25 September 2025
Perihelion distance (q): 1.8
Aphelion distance (Q) : 5.3
Period (years): 6.7
Eccentricity (e): 0.50
Inclination (i): 22.0
JPL orbit diagram
COBS lightcurve
Atlas
T. B. Spahr (University of Arizona, Arizona, USA) discovered this comet with the 0.41-
m f/3 Schmidt telescope in the course of the Catalina Sky Survey on 16 November
1998. He estimated the magnitude as 16.5 and noted a round coma 18 arc seconds
across. No tail was visible. Additional images were obtained on 17 November, at
which time the comet discovery was announced. A prediscovery image was later
found on images taken by the Two Micron All Sky Survey (2MASS) on 13 November
1998.
Observations (VEMag = visual equivalent magnitude)
Date
10x10 mag
Error
VEmag
Coma '
06-Oct-18
18.83
0.14
18.6
0.2
13-Oct-18
18.57
0.03
17.7
0.4
08-Nov-18
17.61
0.02
16.2
0.4
15-Nov-18
17.30
0.02
15.9
0.5
30-Nov-18
16.88
0.05
15.1
0.7
27-Dec-18
17.00
0.01
14.9
0.8
08-Jan-19
17.26
0.02
14.8
0.5