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 |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
17:56:40.36 |
-61:12:35.2 |
HIP 87864 |
13.96 |
| 2026-07-29 12:00 |
17:56:32.36 |
-61:12:07.5 |
HIP 87864 |
14.57 |
| 2026-07-30 00:00 |
17:56:24.43 |
-61:11:39.5 |
HIP 87864 |
15.23 |
| 2026-07-30 12:00 |
17:56:16.57 |
-61:11:11.1 |
HIP 87864 |
15.94 |
| 2026-07-31 00:00 |
17:56:08.80 |
-61:10:42.3 |
HIP 87864 |
16.69 |
| 2026-07-31 12:00 |
17:56:01.10 |
-61:10:13.0 |
HIP 87864 |
17.47 |
| 2026-08-01 00:00 |
17:55:53.47 |
-61:09:43.5 |
HIP 87864 |
18.28 |
| 2026-08-01 12:00 |
17:55:45.93 |
-61:09:13.5 |
HIP 87864 |
19.11 |
| 2026-08-02 00:00 |
17:55:38.47 |
-61:08:43.1 |
HIP 87864 |
19.96 |
| 2026-08-02 12:00 |
17:55:31.08 |
-61:08:12.4 |
HIP 87864 |
20.84 |
| 2026-08-03 00:00 |
17:55:23.78 |
-61:07:41.3 |
HIP 87864 |
21.72 |
| 2026-08-03 12:00 |
17:55:16.56 |
-61:07:09.9 |
HIP 87864 |
22.62 |
| 2026-08-04 00:00 |
17:55:09.41 |
-61:06:38.1 |
HIP 87864 |
23.52 |
| 2026-08-04 12:00 |
17:55:02.36 |
-61:06:05.9 |
HIP 87864 |
24.44 |
| 2026-08-05 00:00 |
17:54:55.38 |
-61:05:33.4 |
HIP 87488 |
23.76 |
| 2026-08-05 12:00 |
17:54:48.49 |
-61:05:00.5 |
HIP 87488 |
22.78 |
| 2026-08-06 00:00 |
17:54:41.69 |
-61:04:27.3 |
HIP 87488 |
21.80 |
| 2026-08-06 12:00 |
17:54:34.97 |
-61:03:53.8 |
HIP 87488 |
20.83 |
| 2026-08-07 00:00 |
17:54:28.33 |
-61:03:19.9 |
HIP 87488 |
19.86 |
| 2026-08-07 12:00 |
17:54:21.78 |
-61:02:45.7 |
HIP 87488 |
18.90 |
| 2026-08-08 00:00 |
17:54:15.32 |
-61:02:11.1 |
HIP 87488 |
17.94 |
| 2026-08-08 12:00 |
17:54:08.95 |
-61:01:36.2 |
HIP 87488 |
16.99 |
| 2026-08-09 00:00 |
17:54:02.66 |
-61:01:01.0 |
HIP 87488 |
16.04 |
| 2026-08-09 12:00 |
17:53:56.47 |
-61:00:25.5 |
HIP 87488 |
15.10 |
| 2026-08-10 00:00 |
17:53:50.36 |
-60:59:49.7 |
HIP 87488 |
14.16 |
| 2026-08-10 12:00 |
17:53:44.35 |
-60:59:13.5 |
HIP 87488 |
13.22 |
| 2026-08-11 00:00 |
17:53:38.42 |
-60:58:37.1 |
HIP 87488 |
12.29 |
| 2026-08-11 12:00 |
17:53:32.59 |
-60:58:00.4 |
HIP 87488 |
11.37 |
| 2026-08-12 00:00 |
17:53:26.85 |
-60:57:23.3 |
HIP 87488 |
10.45 |
| 2026-08-12 12:00 |
17:53:21.20 |
-60:56:46.0 |
HIP 87488 |
9.54 |
| 2026-08-13 00:00 |
17:53:15.64 |
-60:56:08.4 |
HIP 87488 |
8.63 |
| 2026-08-13 12:00 |
17:53:10.18 |
-60:55:30.5 |
HIP 87488 |
7.73 |
| 2026-08-14 00:00 |
17:53:04.81 |
-60:54:52.3 |
HIP 87488 |
6.83 |
| 2026-08-14 12:00 |
17:52:59.54 |
-60:54:13.9 |
HIP 87488 |
5.95 |
| 2026-08-15 00:00 |
17:52:54.36 |
-60:53:35.2 |
HIP 87488 |
5.07 |
| 2026-08-15 12:00 |
17:52:49.28 |
-60:52:56.2 |
HIP 87488 |
4.20 |
| 2026-08-16 00:00 |
17:52:44.30 |
-60:52:17.0 |
HIP 87488 |
3.34 |
| 2026-08-16 12:00 |
17:52:39.41 |
-60:51:37.5 |
HIP 87488 |
2.51 |
| 2026-08-17 00:00 |
17:52:34.61 |
-60:50:57.8 |
HIP 87488 |
1.74 |
| 2026-08-17 12:00 |
17:52:29.92 |
-60:50:17.8 |
HIP 87488 |
1.14 |
| 2026-08-18 00:00 |
17:52:25.32 |
-60:49:37.6 |
HIP 87488 |
1.03 |
| 2026-08-18 12:00 |
17:52:20.82 |
-60:48:57.2 |
HIP 87488 |
1.53 |
| 2026-08-19 00:00 |
17:52:16.42 |
-60:48:16.5 |
HIP 87488 |
2.25 |