318P/McNaught-Hartley
메타데이터
| 항목 |
값 |
| Designation |
318P/McNaught-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-10-21T00:27:13.642560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:23Z |
| Obs used |
442 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
13.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-04-13.0000000 |
| e |
0.67524420 |
| q (au) |
2.445459 |
| a (au) |
7.530148 |
| i (deg) |
17.894853 |
| Ω (om, deg) |
35.754310 |
| ω (w, deg) |
313.177220 |
| M (ma, deg) |
298.659661 |
밝기
산란 + 전체 선형
$$
M_a = (10.986 + 4.792\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.986 |
| n |
4.792 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
2.293 |
| 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) |
| 2026-02-03 00:00 |
11:57:19.26 |
+15:18:40.1 |
HIP 58276 |
8.26 |
| 2026-02-03 12:00 |
11:57:13.85 |
+15:19:34.6 |
HIP 58276 |
8.73 |
| 2026-02-04 00:00 |
11:57:08.37 |
+15:20:29.1 |
HIP 58276 |
9.46 |
| 2026-02-04 12:00 |
11:57:02.82 |
+15:21:23.8 |
HIP 58276 |
10.39 |
| 2026-02-05 00:00 |
11:56:57.21 |
+15:22:18.7 |
HIP 58276 |
11.47 |
| 2026-02-05 12:00 |
11:56:51.54 |
+15:23:13.7 |
HIP 58276 |
12.68 |
| 2026-02-06 00:00 |
11:56:45.81 |
+15:24:08.9 |
HIP 58276 |
13.99 |
| 2026-02-06 12:00 |
11:56:40.01 |
+15:25:04.1 |
HIP 58276 |
15.38 |
| 2026-02-07 00:00 |
11:56:34.15 |
+15:25:59.5 |
HIP 58276 |
16.82 |
| 2026-02-07 12:00 |
11:56:28.23 |
+15:26:55.0 |
HIP 58159 |
16.53 |
| 2026-02-08 00:00 |
11:56:22.25 |
+15:27:50.7 |
HIP 58159 |
14.87 |
| 2026-02-08 12:00 |
11:56:16.20 |
+15:28:46.4 |
HIP 58159 |
13.21 |
| 2026-02-09 00:00 |
11:56:10.10 |
+15:29:42.2 |
HIP 58159 |
11.56 |
| 2026-02-09 12:00 |
11:56:03.94 |
+15:30:38.1 |
HIP 58159 |
9.93 |
| 2026-02-10 00:00 |
11:55:57.72 |
+15:31:34.1 |
HIP 58159 |
8.34 |
| 2026-02-10 12:00 |
11:55:51.44 |
+15:32:30.2 |
HIP 58159 |
6.83 |
| 2026-02-11 00:00 |
11:55:45.10 |
+15:33:26.3 |
HIP 58159 |
5.48 |
| 2026-02-11 12:00 |
11:55:38.71 |
+15:34:22.5 |
HIP 58159 |
4.45 |
| 2026-02-12 00:00 |
11:55:32.26 |
+15:35:18.8 |
HIP 58159 |
4.02 |
| 2026-02-12 12:00 |
11:55:25.75 |
+15:36:15.1 |
HIP 58159 |
4.38 |
| 2026-02-13 00:00 |
11:55:19.19 |
+15:37:11.4 |
HIP 58159 |
5.39 |
| 2026-02-13 12:00 |
11:55:12.58 |
+15:38:07.8 |
HIP 58159 |
6.76 |
| 2026-02-14 00:00 |
11:55:05.91 |
+15:39:04.3 |
HIP 58159 |
8.34 |
| 2026-02-14 12:00 |
11:54:59.19 |
+15:40:00.7 |
HIP 58159 |
10.02 |
| 2026-02-15 00:00 |
11:54:52.41 |
+15:40:57.2 |
HIP 58159 |
11.78 |
| 2026-02-15 12:00 |
11:54:45.59 |
+15:41:53.6 |
HIP 58159 |
13.58 |
| 2026-02-16 00:00 |
11:54:38.71 |
+15:42:50.1 |
HIP 58159 |
15.41 |
| 2026-02-16 12:00 |
11:54:31.78 |
+15:43:46.6 |
HIP 58012 |
13.72 |
| 2026-02-17 00:00 |
11:54:24.80 |
+15:44:43.0 |
HIP 58012 |
11.96 |
| 2026-02-17 12:00 |
11:54:17.78 |
+15:45:39.5 |
HIP 58012 |
10.26 |
| 2026-02-18 00:00 |
11:54:10.71 |
+15:46:35.9 |
HIP 58012 |
8.64 |
| 2026-02-18 12:00 |
11:54:03.59 |
+15:47:32.3 |
HIP 58012 |
7.20 |
| 2026-02-19 00:00 |
11:53:56.42 |
+15:48:28.6 |
HIP 58012 |
6.04 |
| 2026-02-19 12:00 |
11:53:49.21 |
+15:49:24.9 |
HIP 58012 |
5.38 |
| 2026-02-20 00:00 |
11:53:41.95 |
+15:50:21.1 |
HIP 58012 |
5.41 |
| 2026-02-20 12:00 |
11:53:34.65 |
+15:51:17.3 |
HIP 58012 |
6.12 |
| 2026-02-21 00:00 |
11:53:27.30 |
+15:52:13.4 |
HIP 57969 |
6.80 |
| 2026-02-21 12:00 |
11:53:19.92 |
+15:53:09.4 |
HIP 57969 |
5.98 |
| 2026-02-22 00:00 |
11:53:12.49 |
+15:54:05.3 |
HIP 57969 |
5.78 |
| 2026-02-22 12:00 |
11:53:05.02 |
+15:55:01.2 |
HIP 57969 |
6.26 |
| 2026-02-23 00:00 |
11:52:57.51 |
+15:55:56.9 |
HIP 57969 |
7.31 |
| 2026-02-23 12:00 |
11:52:49.97 |
+15:56:52.5 |
HIP 57897 |
7.75 |
| 2026-02-24 00:00 |
11:52:42.38 |
+15:57:48.1 |
HIP 57897 |
7.63 |