| Parameter |
Value |
| Designation |
332P/Ikeya-Murakami |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-10-13T08:06:24.744960Z |
| Orbit solution date (soln_date, UTC) |
2017-01-17T16:14:01Z |
| Obs used |
385 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
22.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-11-20.0000000 |
| e |
0.48859089 |
| q (au) |
1.578843 |
| a (au) |
3.087241 |
| i (deg) |
9.377956 |
| Ω (om, deg) |
3.818489 |
| ω (w, deg) |
152.429576 |
| M (ma, deg) |
6.843119 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.314 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.314 |
| n |
6.000 |
| gf |
0.835 |
| gb |
-0.999 |
| k |
0.921 |
| δ90 |
4.888 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
02:03:23.16 |
+17:39:38.6 |
HIP 9613 |
27.57 |
| 2026-03-26 12:00 |
02:04:05.60 |
+17:43:31.8 |
HIP 9777 |
23.77 |
| 2026-03-27 00:00 |
02:04:48.16 |
+17:47:25.2 |
HIP 9777 |
15.65 |
| 2026-03-27 12:00 |
02:05:30.86 |
+17:51:18.8 |
HIP 9777 |
12.68 |
| 2026-03-28 00:00 |
02:06:13.68 |
+17:55:12.7 |
HIP 9777 |
17.72 |
| 2026-03-28 12:00 |
02:06:56.63 |
+17:59:06.8 |
HIP 9924 |
12.03 |
| 2026-03-29 00:00 |
02:07:39.71 |
+18:03:01.1 |
HIP 9924 |
1.95 |
| 2026-03-29 12:00 |
02:08:22.92 |
+18:06:55.6 |
HIP 9924 |
10.19 |
| 2026-03-30 00:00 |
02:09:06.26 |
+18:10:50.3 |
HIP 9924 |
21.12 |
| 2026-03-30 12:00 |
02:09:49.72 |
+18:14:45.2 |
HIP 9924 |
32.14 |
| 2026-03-31 00:00 |
02:10:33.31 |
+18:18:40.3 |
HIP 10295 |
33.78 |
| 2026-03-31 12:00 |
02:11:17.03 |
+18:22:35.5 |
HIP 10295 |
28.25 |
| 2026-04-01 00:00 |
02:12:00.87 |
+18:26:30.9 |
HIP 10295 |
26.49 |
| 2026-04-01 12:00 |
02:12:44.84 |
+18:30:26.5 |
HIP 10295 |
29.21 |
| 2026-04-02 00:00 |
02:13:28.94 |
+18:34:22.2 |
HIP 10496 |
30.86 |
| 2026-04-02 12:00 |
02:14:13.17 |
+18:38:18.1 |
HIP 10496 |
19.99 |
| 2026-04-03 00:00 |
02:14:57.53 |
+18:42:14.1 |
HIP 10496 |
9.83 |
| 2026-04-03 12:00 |
02:15:42.01 |
+18:46:10.2 |
HIP 10496 |
6.74 |
| 2026-04-04 00:00 |
02:16:26.61 |
+18:50:06.5 |
HIP 10496 |
15.74 |
| 2026-04-04 12:00 |
02:17:11.35 |
+18:54:02.9 |
HIP 10496 |
26.56 |
| 2026-04-05 00:00 |
02:17:56.21 |
+18:57:59.3 |
HIP 10701 |
30.80 |
| 2026-04-05 12:00 |
02:18:41.20 |
+19:01:55.9 |
HIP 10701 |
37.07 |
| 2026-04-06 00:00 |
02:19:26.32 |
+19:05:52.6 |
HIP 10810 |
35.65 |
| 2026-04-06 12:00 |
02:20:11.56 |
+19:09:49.4 |
HIP 10810 |
34.77 |
| 2026-04-07 00:00 |
02:20:56.93 |
+19:13:46.3 |
HIP 11081 |
26.50 |
| 2026-04-07 12:00 |
02:21:42.43 |
+19:17:43.2 |
HIP 11081 |
19.58 |
| 2026-04-08 00:00 |
02:22:28.06 |
+19:21:40.2 |
HIP 11081 |
18.07 |
| 2026-04-08 12:00 |
02:23:13.81 |
+19:25:37.2 |
HIP 11157 |
13.04 |
| 2026-04-09 00:00 |
02:23:59.69 |
+19:29:34.3 |
HIP 11157 |
10.56 |
| 2026-04-09 12:00 |
02:24:45.70 |
+19:33:31.5 |
HIP 11316 |
12.73 |
| 2026-04-10 00:00 |
02:25:31.83 |
+19:37:28.7 |
HIP 11316 |
4.61 |
| 2026-04-10 12:00 |
02:26:18.09 |
+19:41:25.9 |
HIP 11316 |
12.18 |
| 2026-04-11 00:00 |
02:27:04.48 |
+19:45:23.1 |
HIP 11316 |
23.35 |
| 2026-04-11 12:00 |
02:27:50.99 |
+19:49:20.3 |
HIP 11617 |
28.52 |
| 2026-04-12 00:00 |
02:28:37.64 |
+19:53:17.6 |
HIP 11617 |
17.12 |
| 2026-04-12 12:00 |
02:29:24.41 |
+19:57:14.8 |
HIP 11617 |
6.70 |
| 2026-04-13 00:00 |
02:30:11.30 |
+20:01:12.1 |
HIP 11617 |
8.36 |
| 2026-04-13 12:00 |
02:30:58.32 |
+20:05:09.3 |
HIP 11678 |
14.60 |
| 2026-04-14 00:00 |
02:31:45.47 |
+20:09:06.4 |
HIP 11678 |
23.77 |
| 2026-04-14 12:00 |
02:32:32.75 |
+20:13:03.6 |
HIP 11897 |
18.74 |
| 2026-04-15 00:00 |
02:33:20.15 |
+20:17:00.7 |
HIP 11897 |
9.52 |
| 2026-04-15 12:00 |
02:34:07.68 |
+20:20:57.7 |
HIP 11897 |
10.42 |
| 2026-04-16 00:00 |
02:34:55.33 |
+20:24:54.7 |
HIP 12097 |
17.91 |