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Minor planet follow-up portal
v. 3.17.1a
17P/Holmes
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Type
Comet (Jupiter Family)
Status
Actively Following
Characterization Target
Source
LOOK Project
UTC date
------------ Any 1.0m ------------
LSC 1.0m - W85-87; (CTIO, Chile)
ELP 1.0m - V37,V39; (McDonald, Texas)
COJ 1.0m - Q63-64; (Siding Spring, Aust.)
CPT 1.0m - K91-93; (Sutherland, S. Africa)
TFN 1.0m - Z31,Z24; (Tenerife, Spain)
------------ Any 0.4m ------------
LSC 0.4m - W89,W79; (CTIO, Chile)
ELP 0.4m - V38; (McDonald, Texas)
ELP 0.4m - V98; (TEMP; McDonald, Texas)
ELP 0.4m - V99; (TEMP; McDonald, Texas)
OGG 0.4m - T03-04; (Maui, Hawaii)
COJ 0.4m - Q58-59; (Siding Spring, Aust.)
CPT 0.4m - L09; (Sutherland, S. Africa)
TFN 0.4m - Z17,Z21; (Tenerife, Spain)
------------ Any 2.0m ------------
FTS 2.0m - E10; (Siding Spring, Aust.) [MuSCAT4]
FTN 2.0m - F65; (Maui, Hawaii ) [MuSCAT3]
------------ Non LCO ------------
Mt John 1.8m - 474 (Mt John, NZ)
Site
Min Altitude
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Measurements
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Last Update: 2026-Feb-07 20:30
Orbital Elements
MPC Comet
Epoch of elements (MJD)
61000.0
Nov. 21, 2025
Orbital inclination in deg
19.00499
Longitude of Ascending Node (deg)
326.6018
Arg of perihelion (deg)
24.60261
Eccentricity
0.4261604
Perihelion distance (AU)
2.0900068
Epoch of perihelion
Jan. 31, 2028, 6:56 p.m.
Epoch of perihelion (MJD)
61801.78932
Total Magnitude (M1)
9.4
Slope Parameter (k1)
14.75
Physical Parameters
PC
autocmod 3.0f
K212/34
0.03
K2
autocmod 3.0f
K212/34
5.0
M2
from 1246 observations, autocmod 3.0f
K212/34
13.8
+/- 0.9
K1
autocmod 3.0f
K212/34
14.75
M1
2 parameter fit from 806 observations, autocmod 3.0f
K212/34
9.4
+/- 0.9
Diameter
value unverified
DASTCOM
3.42 km
Follow-up Details
Number of observations
2215
Arc length (days)
4401.00
Time since last observation (days)
1066.09
Spectroscopy Details
Known Taxonomies
None
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