Schedule Observations Schedule Spectroscopic Observations
NameX74756 → C/2021 S4
Type Comet
Status Actively Following
Characterization Target
Source LOOK Project
Check Spectroscopic Feasibility Create LC Plot
Recent Blocks Scheduled
  • No blocks have been scheduled
Measurements
Show Measurements
Plot Visibility
Last Update: 2026-Mar-20 20:43
Orbital Elements
MPC Comet
Epoch of elements (MJD)
61000.0 Nov. 21, 2025
Orbital inclination in deg 17.48122
Longitude of Ascending Node (deg) 5.44136
Arg of perihelion (deg) 73.0783
Eccentricity 0.956506
Perihelion distance (AU) 6.6933274
Epoch of perihelion Jan. 3, 2024, 11:06 p.m.
Epoch of perihelion (MJD) 60312.96293
Total Magnitude (M1) 6.4
Slope Parameter (k1) 9.25
Physical Parameters
Reciprocal of semimajor axis E2026-E44
0.00668 au +/- 0.0000007
+/- 0.0000007
PC autocmod 3.0g

76
0.03
K2 autocmod 3.0g

76
5.0
M2 from 6 observations, autocmod 3.0g

76
10.1 +/- 0.4
K1 autocmod 3.0g

76
9.25
M1 from 1099 observations, assumed slope, autocmod 3.0g

76
6.4 +/- 0.7
Diameter Initial Diameter Guess using H=11.4 and albedo=0.14 (0.01 to 0.5)

MPC Default
18640.65 m +51106.0 / -8777.0
Follow-up Details
NEOCP digest2 score 35
Number of observations 2312
Arc length (days) 1629.00
Time since last observation (days) 13.86
Spectroscopy Details
Known Taxonomies None