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) |
| 2026-09-20 00:00 |
17:51:05.69 |
-60:00:15.5 |
HIP 87393 |
10.28 |
| 2026-09-20 12:00 |
17:51:07.91 |
-59:59:29.1 |
HIP 87393 |
10.91 |
| 2026-09-21 00:00 |
17:51:10.23 |
-59:58:42.8 |
HIP 87393 |
11.57 |
| 2026-09-21 12:00 |
17:51:12.66 |
-59:57:56.5 |
HIP 87393 |
12.24 |
| 2026-09-22 00:00 |
17:51:15.18 |
-59:57:10.2 |
HIP 87393 |
12.92 |
| 2026-09-22 12:00 |
17:51:17.80 |
-59:56:24.1 |
HIP 87393 |
13.62 |
| 2026-09-23 00:00 |
17:51:20.52 |
-59:55:37.9 |
HIP 87393 |
14.33 |
| 2026-09-23 12:00 |
17:51:23.34 |
-59:54:51.9 |
HIP 87393 |
15.05 |
| 2026-09-24 00:00 |
17:51:26.26 |
-59:54:05.9 |
HIP 87393 |
15.78 |
| 2026-09-24 12:00 |
17:51:29.28 |
-59:53:20.0 |
HIP 87393 |
16.53 |
| 2026-09-25 00:00 |
17:51:32.39 |
-59:52:34.1 |
HIP 87393 |
17.28 |
| 2026-09-25 12:00 |
17:51:35.60 |
-59:51:48.4 |
HIP 87393 |
18.03 |
| 2026-09-26 00:00 |
17:51:38.91 |
-59:51:02.7 |
HIP 87393 |
18.80 |
| 2026-09-26 12:00 |
17:51:42.31 |
-59:50:17.1 |
HIP 87393 |
19.58 |
| 2026-09-27 00:00 |
17:51:45.81 |
-59:49:31.6 |
HIP 87393 |
20.36 |
| 2026-09-27 12:00 |
17:51:49.41 |
-59:48:46.1 |
HIP 87393 |
21.14 |
| 2026-09-28 00:00 |
17:51:53.10 |
-59:48:00.8 |
HIP 87393 |
21.94 |
| 2026-09-28 12:00 |
17:51:56.89 |
-59:47:15.5 |
HIP 87393 |
22.74 |
| 2026-09-29 00:00 |
17:52:00.78 |
-59:46:30.4 |
HIP 87393 |
23.55 |
| 2026-09-29 12:00 |
17:52:04.75 |
-59:45:45.3 |
HIP 87393 |
24.36 |
| 2026-09-30 00:00 |
17:52:08.83 |
-59:45:00.4 |
HIP 87393 |
25.18 |
| 2026-09-30 12:00 |
17:52:13.00 |
-59:44:15.5 |
HIP 87393 |
26.01 |
| 2026-10-01 00:00 |
17:52:17.26 |
-59:43:30.8 |
HIP 87393 |
26.84 |
| 2026-10-01 12:00 |
17:52:21.62 |
-59:42:46.2 |
HIP 87393 |
27.68 |
| 2026-10-02 00:00 |
17:52:26.07 |
-59:42:01.7 |
HIP 87393 |
28.53 |
| 2026-10-02 12:00 |
17:52:30.61 |
-59:41:17.3 |
HIP 87393 |
29.38 |
| 2026-10-03 00:00 |
17:52:35.25 |
-59:40:33.0 |
HIP 87450 |
29.67 |
| 2026-10-03 12:00 |
17:52:39.98 |
-59:39:48.9 |
HIP 87450 |
29.02 |
| 2026-10-04 00:00 |
17:52:44.80 |
-59:39:04.9 |
HIP 87450 |
28.39 |
| 2026-10-04 12:00 |
17:52:49.72 |
-59:38:21.0 |
HIP 87450 |
27.78 |
| 2026-10-05 00:00 |
17:52:54.73 |
-59:37:37.2 |
HIP 87450 |
27.20 |
| 2026-10-05 12:00 |
17:52:59.83 |
-59:36:53.6 |
HIP 87450 |
26.65 |
| 2026-10-06 00:00 |
17:53:05.02 |
-59:36:10.2 |
HIP 87450 |
26.13 |
| 2026-10-06 12:00 |
17:53:10.30 |
-59:35:26.8 |
HIP 87450 |
25.64 |
| 2026-10-07 00:00 |
17:53:15.67 |
-59:34:43.6 |
HIP 87450 |
25.18 |
| 2026-10-07 12:00 |
17:53:21.14 |
-59:34:00.6 |
HIP 87450 |
24.77 |
| 2026-10-08 00:00 |
17:53:26.69 |
-59:33:17.7 |
HIP 87450 |
24.39 |
| 2026-10-08 12:00 |
17:53:32.33 |
-59:32:35.0 |
HIP 87450 |
24.06 |
| 2026-10-09 00:00 |
17:53:38.07 |
-59:31:52.4 |
HIP 87450 |
23.78 |
| 2026-10-09 12:00 |
17:53:43.89 |
-59:31:10.0 |
HIP 87450 |
23.55 |
| 2026-10-10 00:00 |
17:53:49.80 |
-59:30:27.7 |
HIP 87450 |
23.36 |
| 2026-10-10 12:00 |
17:53:55.80 |
-59:29:45.6 |
HIP 87450 |
23.23 |
| 2026-10-11 00:00 |
17:54:01.88 |
-59:29:03.7 |
HIP 87450 |
23.16 |