| Parameter |
Value |
| Designation |
76P/West-Kohoutek-Ikemura |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-05-07T18:45:44.487360Z |
| Orbit solution date (soln_date, UTC) |
2026-05-29T11:31:18Z |
| Obs used |
963 |
| NEO |
- |
| M1 |
16.400 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-11-28.0000000 |
| e |
0.53889844 |
| q (au) |
1.600203 |
| a (au) |
3.470391 |
| i (deg) |
30.483083 |
| Ω (om, deg) |
84.124220 |
| ω (w, deg) |
0.071296 |
| M (ma, deg) |
335.488311 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.527 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.527 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
11:39:23.97 |
+24:46:30.0 |
HIP 56796 |
17.70 |
| 2026-09-20 12:00 |
11:40:30.83 |
+24:41:29.4 |
HIP 57008 |
11.98 |
| 2026-09-21 00:00 |
11:41:37.53 |
+24:36:29.1 |
HIP 57008 |
13.02 |
| 2026-09-21 12:00 |
11:42:44.05 |
+24:31:29.0 |
HIP 57008 |
26.51 |
| 2026-09-22 00:00 |
11:43:50.40 |
+24:26:29.2 |
HIP 57198 |
25.88 |
| 2026-09-22 12:00 |
11:44:56.59 |
+24:21:29.8 |
HIP 57420 |
24.41 |
| 2026-09-23 00:00 |
11:46:02.60 |
+24:16:30.6 |
HIP 57513 |
19.62 |
| 2026-09-23 12:00 |
11:47:08.45 |
+24:11:31.7 |
HIP 57539 |
12.11 |
| 2026-09-24 00:00 |
11:48:14.13 |
+24:06:33.2 |
HIP 57539 |
10.61 |
| 2026-09-24 12:00 |
11:49:19.64 |
+24:01:35.0 |
HIP 57539 |
24.00 |
| 2026-09-25 00:00 |
11:50:24.98 |
+23:56:37.3 |
HIP 57842 |
21.56 |
| 2026-09-25 12:00 |
11:51:30.16 |
+23:51:39.9 |
HIP 57842 |
7.78 |
| 2026-09-26 00:00 |
11:52:35.18 |
+23:46:42.9 |
HIP 57930 |
4.07 |
| 2026-09-26 12:00 |
11:53:40.03 |
+23:41:46.3 |
HIP 57930 |
11.90 |
| 2026-09-27 00:00 |
11:54:44.72 |
+23:36:50.2 |
HIP 58071 |
12.07 |
| 2026-09-27 12:00 |
11:55:49.24 |
+23:31:54.5 |
HIP 58071 |
23.99 |
| 2026-09-28 00:00 |
11:56:53.61 |
+23:26:59.3 |
HIP 58300 |
29.00 |
| 2026-09-28 12:00 |
11:57:57.81 |
+23:22:04.6 |
HIP 58300 |
25.10 |
| 2026-09-29 00:00 |
11:59:01.85 |
+23:17:10.4 |
HIP 58300 |
30.03 |
| 2026-09-29 12:00 |
12:00:05.73 |
+23:12:16.7 |
HIP 58622 |
17.54 |
| 2026-09-30 00:00 |
12:01:09.45 |
+23:07:23.5 |
HIP 58622 |
2.13 |
| 2026-09-30 12:00 |
12:02:13.01 |
+23:02:30.9 |
HIP 58622 |
13.31 |
| 2026-10-01 00:00 |
12:03:16.42 |
+22:57:38.9 |
HIP 58622 |
28.69 |
| 2026-10-01 12:00 |
12:04:19.67 |
+22:52:47.4 |
HIP 59015 |
30.36 |
| 2026-10-02 00:00 |
12:05:22.76 |
+22:47:56.6 |
HIP 59015 |
25.87 |
| 2026-10-02 12:00 |
12:06:25.69 |
+22:43:06.3 |
HIP 59160 |
24.02 |
| 2026-10-03 00:00 |
12:07:28.47 |
+22:38:16.7 |
HIP 59160 |
9.30 |
| 2026-10-03 12:00 |
12:08:31.10 |
+22:33:27.7 |
HIP 59160 |
7.88 |
| 2026-10-04 00:00 |
12:09:33.57 |
+22:28:39.4 |
HIP 59303 |
11.41 |
| 2026-10-04 12:00 |
12:10:35.88 |
+22:23:51.8 |
HIP 59421 |
15.83 |
| 2026-10-05 00:00 |
12:11:38.04 |
+22:19:04.9 |
HIP 59421 |
16.96 |
| 2026-10-05 12:00 |
12:12:40.05 |
+22:14:18.7 |
HIP 59596 |
15.42 |
| 2026-10-06 00:00 |
12:13:41.91 |
+22:09:33.3 |
HIP 59596 |
9.75 |
| 2026-10-06 12:00 |
12:14:43.61 |
+22:04:48.6 |
HIP 59756 |
12.18 |
| 2026-10-07 00:00 |
12:15:45.16 |
+22:00:04.7 |
HIP 59756 |
16.31 |
| 2026-10-07 12:00 |
12:16:46.55 |
+21:55:21.6 |
HIP 59911 |
18.81 |
| 2026-10-08 00:00 |
12:17:47.80 |
+21:50:39.2 |
HIP 59942 |
19.42 |
| 2026-10-08 12:00 |
12:18:48.89 |
+21:45:57.7 |
HIP 60033 |
15.23 |
| 2026-10-09 00:00 |
12:19:49.83 |
+21:41:17.1 |
HIP 60033 |
18.90 |
| 2026-10-09 12:00 |
12:20:50.62 |
+21:36:37.3 |
HIP 60290 |
20.20 |
| 2026-10-10 00:00 |
12:21:51.26 |
+21:31:58.3 |
HIP 60282 |
14.05 |
| 2026-10-10 12:00 |
12:22:51.75 |
+21:27:20.3 |
HIP 60282 |
19.17 |
| 2026-10-11 00:00 |
12:23:52.08 |
+21:22:43.1 |
HIP 60556 |
19.98 |