메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (14.858 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.858 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
23:02:10.61 |
-24:13:24.0 |
HIP 113605 |
26.36 |
| 2026-03-26 12:00 |
23:03:10.97 |
-24:06:45.7 |
HIP 113937 |
16.58 |
| 2026-03-27 00:00 |
23:04:11.34 |
-24:00:06.4 |
HIP 113937 |
7.38 |
| 2026-03-27 12:00 |
23:05:11.72 |
-23:53:26.0 |
HIP 113983 |
3.86 |
| 2026-03-28 00:00 |
23:06:12.11 |
-23:46:44.5 |
HIP 114119 |
6.91 |
| 2026-03-28 12:00 |
23:07:12.51 |
-23:40:02.0 |
HIP 114119 |
8.57 |
| 2026-03-29 00:00 |
23:08:12.92 |
-23:33:18.4 |
HIP 114119 |
23.92 |
| 2026-03-29 12:00 |
23:09:13.34 |
-23:26:33.8 |
HIP 114359 |
21.46 |
| 2026-03-30 00:00 |
23:10:13.77 |
-23:19:48.2 |
HIP 114387 |
13.94 |
| 2026-03-30 12:00 |
23:11:14.22 |
-23:13:01.4 |
HIP 114387 |
18.59 |
| 2026-03-31 00:00 |
23:12:14.68 |
-23:06:13.6 |
HIP 114572 |
7.41 |
| 2026-03-31 12:00 |
23:13:15.15 |
-22:59:24.8 |
HIP 114572 |
9.27 |
| 2026-04-01 00:00 |
23:14:15.64 |
-22:52:34.9 |
HIP 114572 |
24.46 |
| 2026-04-01 12:00 |
23:15:16.14 |
-22:45:43.9 |
HIP 114999 |
30.70 |
| 2026-04-02 00:00 |
23:16:16.65 |
-22:38:51.9 |
HIP 114999 |
19.38 |
| 2026-04-02 12:00 |
23:17:17.18 |
-22:31:58.8 |
HIP 114999 |
17.09 |
| 2026-04-03 00:00 |
23:18:17.72 |
-22:25:04.7 |
HIP 115103 |
18.64 |
| 2026-04-03 12:00 |
23:19:18.28 |
-22:18:09.4 |
HIP 115103 |
12.09 |
| 2026-04-04 00:00 |
23:20:18.85 |
-22:11:13.2 |
HIP 115103 |
20.83 |
| 2026-04-04 12:00 |
23:21:19.44 |
-22:04:15.8 |
HIP 115103 |
34.83 |
| 2026-04-05 00:00 |
23:22:20.05 |
-21:57:17.4 |
HIP 115522 |
26.45 |
| 2026-04-05 12:00 |
23:23:20.67 |
-21:50:18.0 |
HIP 115522 |
10.77 |
| 2026-04-06 00:00 |
23:24:21.31 |
-21:43:17.4 |
HIP 115522 |
5.11 |
| 2026-04-06 12:00 |
23:25:21.97 |
-21:36:15.9 |
HIP 115587 |
12.60 |
| 2026-04-07 00:00 |
23:26:22.65 |
-21:29:13.2 |
HIP 115709 |
15.52 |
| 2026-04-07 12:00 |
23:27:23.34 |
-21:22:09.5 |
HIP 115702 |
16.22 |
| 2026-04-08 00:00 |
23:28:24.05 |
-21:15:04.8 |
HIP 115881 |
13.57 |
| 2026-04-08 12:00 |
23:29:24.79 |
-21:07:58.9 |
HIP 115881 |
22.60 |
| 2026-04-09 00:00 |
23:30:25.53 |
-21:00:52.1 |
HIP 116125 |
23.94 |
| 2026-04-09 12:00 |
23:31:26.30 |
-20:53:44.1 |
HIP 116125 |
21.88 |
| 2026-04-10 00:00 |
23:32:27.09 |
-20:46:35.1 |
HIP 116247 |
14.23 |
| 2026-04-10 12:00 |
23:33:27.90 |
-20:39:25.1 |
HIP 116283 |
7.80 |
| 2026-04-11 00:00 |
23:34:28.73 |
-20:32:14.0 |
HIP 116283 |
19.02 |
| 2026-04-11 12:00 |
23:35:29.58 |
-20:25:01.8 |
HIP 116283 |
34.24 |
| 2026-04-12 00:00 |
23:36:30.44 |
-20:17:48.6 |
HIP 116560 |
39.67 |
| 2026-04-12 12:00 |
23:37:31.33 |
-20:10:34.4 |
HIP 116675 |
44.62 |
| 2026-04-13 00:00 |
23:38:32.24 |
-20:03:19.1 |
HIP 116874 |
40.12 |
| 2026-04-13 12:00 |
23:39:33.18 |
-19:56:02.8 |
HIP 116874 |
27.34 |
| 2026-04-14 00:00 |
23:40:34.13 |
-19:48:45.4 |
HIP 116874 |
20.00 |
| 2026-04-14 12:00 |
23:41:35.10 |
-19:41:27.0 |
HIP 116973 |
19.85 |
| 2026-04-15 00:00 |
23:42:36.10 |
-19:34:07.5 |
HIP 116973 |
18.88 |
| 2026-04-15 12:00 |
23:43:37.11 |
-19:26:47.0 |
HIP 116973 |
28.97 |
| 2026-04-16 00:00 |
23:44:38.15 |
-19:19:25.4 |
HIP 117118 |
32.36 |