C/2017 F2 (PANSTARRS)
메타데이터
| 항목 |
값 |
| Designation |
C/2017 F2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-26T04:31:31.609920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:32Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
11.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-09-02.0000000 |
| e |
1.00519546 |
| q (au) |
6.927697 |
| a (au) |
-1333.414094 |
| i (deg) |
42.507666 |
| Ω (om, deg) |
38.668006 |
| ω (w, deg) |
134.901946 |
| M (ma, deg) |
-0.001724 |
밝기
산란 + 전체 선형
$$
M_a = (3.109 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
3.109 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
18:13:21.79 |
-57:38:26.5 |
HIP 89430 |
19.15 |
| 2026-02-03 12:00 |
18:13:32.83 |
-57:39:07.4 |
HIP 89430 |
17.60 |
| 2026-02-04 00:00 |
18:13:43.81 |
-57:39:48.6 |
HIP 89430 |
16.07 |
| 2026-02-04 12:00 |
18:13:54.73 |
-57:40:30.1 |
HIP 89430 |
14.57 |
| 2026-02-05 00:00 |
18:14:05.60 |
-57:41:11.9 |
HIP 89430 |
13.09 |
| 2026-02-05 12:00 |
18:14:16.40 |
-57:41:54.0 |
HIP 89430 |
11.65 |
| 2026-02-06 00:00 |
18:14:27.15 |
-57:42:36.4 |
HIP 89430 |
10.25 |
| 2026-02-06 12:00 |
18:14:37.84 |
-57:43:19.1 |
HIP 89430 |
8.92 |
| 2026-02-07 00:00 |
18:14:48.46 |
-57:44:02.1 |
HIP 89430 |
7.69 |
| 2026-02-07 12:00 |
18:14:59.02 |
-57:44:45.5 |
HIP 89430 |
6.61 |
| 2026-02-08 00:00 |
18:15:09.52 |
-57:45:29.1 |
HIP 89430 |
5.77 |
| 2026-02-08 12:00 |
18:15:19.96 |
-57:46:13.0 |
HIP 89430 |
5.26 |
| 2026-02-09 00:00 |
18:15:30.34 |
-57:46:57.2 |
HIP 89430 |
5.19 |
| 2026-02-09 12:00 |
18:15:40.65 |
-57:47:41.8 |
HIP 89430 |
5.56 |
| 2026-02-10 00:00 |
18:15:50.89 |
-57:48:26.6 |
HIP 89430 |
6.30 |
| 2026-02-10 12:00 |
18:16:01.07 |
-57:49:11.7 |
HIP 89430 |
7.29 |
| 2026-02-11 00:00 |
18:16:11.19 |
-57:49:57.1 |
HIP 89430 |
8.44 |
| 2026-02-11 12:00 |
18:16:21.24 |
-57:50:42.8 |
HIP 89430 |
9.69 |
| 2026-02-12 00:00 |
18:16:31.22 |
-57:51:28.8 |
HIP 89430 |
11.01 |
| 2026-02-12 12:00 |
18:16:41.13 |
-57:52:15.1 |
HIP 89430 |
12.36 |
| 2026-02-13 00:00 |
18:16:50.98 |
-57:53:01.7 |
HIP 89430 |
13.74 |
| 2026-02-13 12:00 |
18:17:00.75 |
-57:53:48.5 |
HIP 89430 |
15.14 |
| 2026-02-14 00:00 |
18:17:10.46 |
-57:54:35.7 |
HIP 89430 |
16.55 |
| 2026-02-14 12:00 |
18:17:20.09 |
-57:55:23.1 |
HIP 89652 |
16.12 |
| 2026-02-15 00:00 |
18:17:29.66 |
-57:56:10.8 |
HIP 89652 |
15.10 |
| 2026-02-15 12:00 |
18:17:39.15 |
-57:56:58.8 |
HIP 89652 |
14.17 |
| 2026-02-16 00:00 |
18:17:48.58 |
-57:57:47.1 |
HIP 89652 |
13.33 |
| 2026-02-16 12:00 |
18:17:57.93 |
-57:58:35.6 |
HIP 89652 |
12.61 |
| 2026-02-17 00:00 |
18:18:07.20 |
-57:59:24.4 |
HIP 89652 |
12.02 |
| 2026-02-17 12:00 |
18:18:16.41 |
-58:00:13.5 |
HIP 89652 |
11.57 |
| 2026-02-18 00:00 |
18:18:25.53 |
-58:01:02.9 |
HIP 89652 |
11.30 |
| 2026-02-18 12:00 |
18:18:34.59 |
-58:01:52.5 |
HIP 89652 |
11.20 |
| 2026-02-19 00:00 |
18:18:43.57 |
-58:02:42.4 |
HIP 89652 |
11.27 |
| 2026-02-19 12:00 |
18:18:52.47 |
-58:03:32.5 |
HIP 89652 |
11.52 |
| 2026-02-20 00:00 |
18:19:01.29 |
-58:04:23.0 |
HIP 89652 |
11.93 |
| 2026-02-20 12:00 |
18:19:10.04 |
-58:05:13.6 |
HIP 89652 |
12.47 |
| 2026-02-21 00:00 |
18:19:18.71 |
-58:06:04.6 |
HIP 89652 |
13.14 |
| 2026-02-21 12:00 |
18:19:27.31 |
-58:06:55.8 |
HIP 89652 |
13.92 |
| 2026-02-22 00:00 |
18:19:35.82 |
-58:07:47.2 |
HIP 89652 |
14.77 |
| 2026-02-22 12:00 |
18:19:44.25 |
-58:08:38.9 |
HIP 89652 |
15.70 |
| 2026-02-23 00:00 |
18:19:52.61 |
-58:09:30.9 |
HIP 89652 |
16.68 |
| 2026-02-23 12:00 |
18:20:00.88 |
-58:10:23.1 |
HIP 89652 |
17.70 |
| 2026-02-24 00:00 |
18:20:09.08 |
-58:11:15.5 |
HIP 89652 |
18.76 |