| Parameter |
Value |
| Designation |
112P/Urata-Niijima |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-06-24T12:01:14.373120Z |
| Orbit solution date (soln_date, UTC) |
2021-09-20T10:16:48Z |
| Obs used |
617 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
15.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-10-02.0000000 |
| e |
0.58749274 |
| q (au) |
1.458798 |
| a (au) |
3.536417 |
| i (deg) |
24.201453 |
| Ω (om, deg) |
31.931835 |
| ω (w, deg) |
21.352202 |
| M (ma, deg) |
212.314948 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.858 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.858 |
| 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) |
| 2026-07-29 00:00 |
03:38:22.24 |
+12:56:52.1 |
HIP 17065 |
17.98 |
| 2026-07-29 12:00 |
03:39:42.16 |
+13:08:14.1 |
HIP 17133 |
7.71 |
| 2026-07-30 00:00 |
03:41:02.29 |
+13:19:37.0 |
HIP 17238 |
13.54 |
| 2026-07-30 12:00 |
03:42:22.61 |
+13:31:01.0 |
HIP 17238 |
12.88 |
| 2026-07-31 00:00 |
03:43:43.15 |
+13:42:26.0 |
HIP 17480 |
22.45 |
| 2026-07-31 12:00 |
03:45:03.89 |
+13:53:52.0 |
HIP 17480 |
7.34 |
| 2026-08-01 00:00 |
03:46:24.84 |
+14:05:18.9 |
HIP 17714 |
17.81 |
| 2026-08-01 12:00 |
03:47:46.00 |
+14:16:46.7 |
HIP 17726 |
4.85 |
| 2026-08-02 00:00 |
03:49:07.37 |
+14:28:15.5 |
HIP 17726 |
21.16 |
| 2026-08-02 12:00 |
03:50:28.96 |
+14:39:45.2 |
HIP 17836 |
28.90 |
| 2026-08-03 00:00 |
03:51:50.76 |
+14:51:15.8 |
HIP 18158 |
32.35 |
| 2026-08-03 12:00 |
03:53:12.78 |
+15:02:47.3 |
HIP 18228 |
12.00 |
| 2026-08-04 00:00 |
03:54:35.02 |
+15:14:19.7 |
HIP 18228 |
11.63 |
| 2026-08-04 12:00 |
03:55:57.47 |
+15:25:52.9 |
HIP 18474 |
14.83 |
| 2026-08-05 00:00 |
03:57:20.15 |
+15:37:26.9 |
HIP 18474 |
8.35 |
| 2026-08-05 12:00 |
03:58:43.04 |
+15:49:01.8 |
HIP 18626 |
7.15 |
| 2026-08-06 00:00 |
04:00:06.16 |
+16:00:37.4 |
HIP 18626 |
17.40 |
| 2026-08-06 12:00 |
04:01:29.50 |
+16:12:13.8 |
HIP 18754 |
20.19 |
| 2026-08-07 00:00 |
04:02:53.07 |
+16:23:51.0 |
HIP 18754 |
27.76 |
| 2026-08-07 12:00 |
04:04:16.86 |
+16:35:28.9 |
HIP 19032 |
5.38 |
| 2026-08-08 00:00 |
04:05:40.88 |
+16:47:07.5 |
HIP 19032 |
17.91 |
| 2026-08-08 12:00 |
04:07:05.12 |
+16:58:46.8 |
HIP 19284 |
25.21 |
| 2026-08-09 00:00 |
04:08:29.60 |
+17:10:26.8 |
HIP 19358 |
8.51 |
| 2026-08-09 12:00 |
04:09:54.30 |
+17:22:07.4 |
HIP 19472 |
4.65 |
| 2026-08-10 00:00 |
04:11:19.23 |
+17:33:48.6 |
HIP 19472 |
19.49 |
| 2026-08-10 12:00 |
04:12:44.39 |
+17:45:30.5 |
HIP 19651 |
4.81 |
| 2026-08-11 00:00 |
04:14:09.79 |
+17:57:13.0 |
HIP 19651 |
22.94 |
| 2026-08-11 12:00 |
04:15:35.41 |
+18:08:56.0 |
HIP 19847 |
28.91 |
| 2026-08-12 00:00 |
04:17:01.27 |
+18:20:39.6 |
HIP 20056 |
15.29 |
| 2026-08-12 12:00 |
04:18:27.37 |
+18:32:23.7 |
HIP 20056 |
18.03 |
| 2026-08-13 00:00 |
04:19:53.70 |
+18:44:08.2 |
HIP 20255 |
7.43 |
| 2026-08-13 12:00 |
04:21:20.26 |
+18:55:53.3 |
HIP 20255 |
17.29 |
| 2026-08-14 00:00 |
04:22:47.07 |
+19:07:38.8 |
HIP 20369 |
25.51 |
| 2026-08-14 12:00 |
04:24:14.11 |
+19:19:24.8 |
HIP 20614 |
19.70 |
| 2026-08-15 00:00 |
04:25:41.39 |
+19:31:11.1 |
HIP 20774 |
27.08 |
| 2026-08-15 12:00 |
04:27:08.92 |
+19:42:57.9 |
HIP 20774 |
7.83 |
| 2026-08-16 00:00 |
04:28:36.68 |
+19:54:45.0 |
HIP 20890 |
10.30 |
| 2026-08-16 12:00 |
04:30:04.69 |
+20:06:32.4 |
HIP 21008 |
16.40 |
| 2026-08-17 00:00 |
04:31:32.95 |
+20:18:20.1 |
HIP 21099 |
11.11 |
| 2026-08-17 12:00 |
04:33:01.45 |
+20:30:08.1 |
HIP 21314 |
24.21 |
| 2026-08-18 00:00 |
04:34:30.20 |
+20:41:56.4 |
HIP 21314 |
22.46 |
| 2026-08-18 12:00 |
04:35:59.20 |
+20:53:44.9 |
HIP 21318 |
23.27 |
| 2026-08-19 00:00 |
04:37:28.45 |
+21:05:33.5 |
HIP 21604 |
26.86 |