Schedule Observations Schedule Spectroscopic Observations
NameN00htdm → C/2021 A4
Type Comet (Long Period)
Status Not Following
Source Minor Planet Center
Check Spectroscopic Feasibility Create LC Plot
Recent Blocks Scheduled
  • No blocks have been scheduled
Measurements
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Last Update: 2021-Jul-07 00:00
Orbital Elements
MPC Comet
Epoch of elements (MJD)
59400.0 July 5, 2021
Orbital inclination in deg 111.57084
Longitude of Ascending Node (deg) 307.08411
Arg of perihelion (deg) 204.66162
Eccentricity 0.9733404
Perihelion distance (AU) 1.1455136
Epoch of perihelion March 20, 2021, 12:46 a.m.
Epoch of perihelion (MJD) 59293.03225
Total Magnitude (M1) 13.7
Slope Parameter (k1) 27.75
Physical Parameters
Reciprocal of semimajor axis E2021-R75
0.023784 au +/- 0.0000185
+/- 0.0000185
PC autocmod 2.9e

12
0.03
K2 autocmod 2.9e

12
5.0
M2 from 47 observations, autocmod 2.9e

12
17.5 +/- 0.3
K1 autocmod 2.9e

12
27.75
M1 2 parameter fit from 554 observations, autocmod 2.9e

12
13.7 +/- 0.6
Diameter Initial Diameter Guess using H=16.8 and albedo=0.14 (0.01 to 0.5)

MPC Default
1550.46 m +4251.0 / -730.0
Follow-up Details
NEOCP digest2 score 35
Number of observations 709
Arc length (days) 185.00
Time since last observation (days) 235.07
Spectroscopy Details
Known Taxonomies None