| 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
$$
M_a = (19.157 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.157 |
| n |
6.000 |
| gf |
0.876 |
| gb |
-0.998 |
| k |
0.935 |
| δ90 |
6.855 |
| 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) |
| 2026-07-29 00:00 |
06:06:15.67 |
+30:02:30.0 |
HIP 29060 |
20.47 |
| 2026-07-29 12:00 |
06:07:29.69 |
+30:02:57.4 |
HIP 29060 |
5.33 |
| 2026-07-30 00:00 |
06:08:43.82 |
+30:03:22.8 |
HIP 29060 |
12.33 |
| 2026-07-30 12:00 |
06:09:58.06 |
+30:03:46.1 |
HIP 29060 |
28.14 |
| 2026-07-31 00:00 |
06:11:12.41 |
+30:04:07.4 |
HIP 29463 |
22.20 |
| 2026-07-31 12:00 |
06:12:26.87 |
+30:04:26.7 |
HIP 29463 |
14.53 |
| 2026-08-01 00:00 |
06:13:41.43 |
+30:04:43.9 |
HIP 29463 |
21.18 |
| 2026-08-01 12:00 |
06:14:56.10 |
+30:04:59.0 |
HIP 29790 |
18.31 |
| 2026-08-02 00:00 |
06:16:10.87 |
+30:05:12.1 |
HIP 29790 |
2.31 |
| 2026-08-02 12:00 |
06:17:25.75 |
+30:05:23.0 |
HIP 29790 |
14.12 |
| 2026-08-03 00:00 |
06:18:40.74 |
+30:05:31.9 |
HIP 30036 |
12.33 |
| 2026-08-03 12:00 |
06:19:55.83 |
+30:05:38.6 |
HIP 30036 |
13.55 |
| 2026-08-04 00:00 |
06:21:11.02 |
+30:05:43.3 |
HIP 30182 |
9.68 |
| 2026-08-04 12:00 |
06:22:26.32 |
+30:05:45.8 |
HIP 30273 |
9.29 |
| 2026-08-05 00:00 |
06:23:41.72 |
+30:05:46.1 |
HIP 30510 |
14.76 |
| 2026-08-05 12:00 |
06:24:57.22 |
+30:05:44.3 |
HIP 30510 |
3.90 |
| 2026-08-06 00:00 |
06:26:12.82 |
+30:05:40.4 |
HIP 30510 |
18.63 |
| 2026-08-06 12:00 |
06:27:28.52 |
+30:05:34.3 |
HIP 30855 |
19.95 |
| 2026-08-07 00:00 |
06:28:44.32 |
+30:05:26.0 |
HIP 30855 |
11.69 |
| 2026-08-07 12:00 |
06:30:00.22 |
+30:05:15.6 |
HIP 31036 |
18.40 |
| 2026-08-08 00:00 |
06:31:16.22 |
+30:05:02.9 |
HIP 31036 |
16.70 |
| 2026-08-08 12:00 |
06:32:32.31 |
+30:04:48.1 |
HIP 31233 |
16.29 |
| 2026-08-09 00:00 |
06:33:48.50 |
+30:04:31.1 |
HIP 31389 |
17.18 |
| 2026-08-09 12:00 |
06:35:04.78 |
+30:04:11.8 |
HIP 31389 |
11.93 |
| 2026-08-10 00:00 |
06:36:21.16 |
+30:03:50.3 |
HIP 31562 |
2.50 |
| 2026-08-10 12:00 |
06:37:37.63 |
+30:03:26.6 |
HIP 31659 |
8.91 |
| 2026-08-11 00:00 |
06:38:54.19 |
+30:03:00.7 |
HIP 31853 |
17.46 |
| 2026-08-11 12:00 |
06:40:10.84 |
+30:02:32.5 |
HIP 31969 |
13.58 |
| 2026-08-12 00:00 |
06:41:27.58 |
+30:02:02.1 |
HIP 31969 |
13.07 |
| 2026-08-12 12:00 |
06:42:44.41 |
+30:01:29.4 |
HIP 32014 |
26.37 |
| 2026-08-13 00:00 |
06:44:01.33 |
+30:00:54.4 |
HIP 32298 |
29.13 |
| 2026-08-13 12:00 |
06:45:18.33 |
+30:00:17.2 |
HIP 32468 |
19.04 |
| 2026-08-14 00:00 |
06:46:35.41 |
+29:59:37.7 |
HIP 32468 |
9.22 |
| 2026-08-14 12:00 |
06:47:52.59 |
+29:58:55.9 |
HIP 32566 |
8.19 |
| 2026-08-15 00:00 |
06:49:09.84 |
+29:58:11.8 |
HIP 32566 |
20.36 |
| 2026-08-15 12:00 |
06:50:27.18 |
+29:57:25.4 |
HIP 32834 |
22.54 |
| 2026-08-16 00:00 |
06:51:44.60 |
+29:56:36.6 |
HIP 32834 |
26.83 |
| 2026-08-16 12:00 |
06:53:02.10 |
+29:55:45.6 |
HIP 33219 |
23.54 |
| 2026-08-17 00:00 |
06:54:19.67 |
+29:54:52.2 |
HIP 33219 |
7.90 |
| 2026-08-17 12:00 |
06:55:37.33 |
+29:53:56.5 |
HIP 33219 |
11.74 |
| 2026-08-18 00:00 |
06:56:55.07 |
+29:52:58.5 |
HIP 33287 |
25.17 |
| 2026-08-18 12:00 |
06:58:12.88 |
+29:51:58.1 |
HIP 33701 |
25.39 |
| 2026-08-19 00:00 |
06:59:30.77 |
+29:50:55.4 |
HIP 33701 |
9.11 |