P/2017 G1 (PANSTARRS)
메타데이터
| 항목 |
값 |
| Designation |
P/2017 G1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-05-02T00:43:36.451200Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:43:31Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
6.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-04-10.0000000 |
| e |
0.65703536 |
| q (au) |
2.620459 |
| a (au) |
7.640611 |
| i (deg) |
3.575512 |
| Ω (om, deg) |
258.564840 |
| ω (w, deg) |
217.570539 |
| M (ma, deg) |
16.005444 |
밝기
산란 + 전체 선형
$$
M_a = (17.768 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.768 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.557 |
| 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) |
| 2026-02-03 00:00 |
19:43:30.02 |
-17:49:08.1 |
HIP 96921 |
22.28 |
| 2026-02-03 12:00 |
19:43:40.78 |
-17:48:36.7 |
HIP 96921 |
24.81 |
| 2026-02-04 00:00 |
19:43:51.52 |
-17:48:05.3 |
HIP 97134 |
25.82 |
| 2026-02-04 12:00 |
19:44:02.22 |
-17:47:33.8 |
HIP 97134 |
24.50 |
| 2026-02-05 00:00 |
19:44:12.90 |
-17:47:02.3 |
HIP 97192 |
22.86 |
| 2026-02-05 12:00 |
19:44:23.56 |
-17:46:30.7 |
HIP 97192 |
20.90 |
| 2026-02-06 00:00 |
19:44:34.19 |
-17:45:59.1 |
HIP 97192 |
19.09 |
| 2026-02-06 12:00 |
19:44:44.79 |
-17:45:27.4 |
HIP 97192 |
17.48 |
| 2026-02-07 00:00 |
19:44:55.36 |
-17:44:55.8 |
HIP 97192 |
16.12 |
| 2026-02-07 12:00 |
19:45:05.90 |
-17:44:24.0 |
HIP 97192 |
15.09 |
| 2026-02-08 00:00 |
19:45:16.41 |
-17:43:52.3 |
HIP 97192 |
14.44 |
| 2026-02-08 12:00 |
19:45:26.89 |
-17:43:20.5 |
HIP 97192 |
14.23 |
| 2026-02-09 00:00 |
19:45:37.35 |
-17:42:48.7 |
HIP 97192 |
14.47 |
| 2026-02-09 12:00 |
19:45:47.77 |
-17:42:16.8 |
HIP 97192 |
15.13 |
| 2026-02-10 00:00 |
19:45:58.16 |
-17:41:44.9 |
HIP 97192 |
16.17 |
| 2026-02-10 12:00 |
19:46:08.51 |
-17:41:13.0 |
HIP 97192 |
17.51 |
| 2026-02-11 00:00 |
19:46:18.84 |
-17:40:41.1 |
HIP 97192 |
19.08 |
| 2026-02-11 12:00 |
19:46:29.13 |
-17:40:09.2 |
HIP 97192 |
20.83 |
| 2026-02-12 00:00 |
19:46:39.39 |
-17:39:37.2 |
HIP 97419 |
22.13 |
| 2026-02-12 12:00 |
19:46:49.61 |
-17:39:05.2 |
HIP 97419 |
19.75 |
| 2026-02-13 00:00 |
19:46:59.80 |
-17:38:33.2 |
HIP 97419 |
17.42 |
| 2026-02-13 12:00 |
19:47:09.95 |
-17:38:01.2 |
HIP 97419 |
15.15 |
| 2026-02-14 00:00 |
19:47:20.07 |
-17:37:29.2 |
HIP 97419 |
12.95 |
| 2026-02-14 12:00 |
19:47:30.15 |
-17:36:57.1 |
HIP 97419 |
10.88 |
| 2026-02-15 00:00 |
19:47:40.19 |
-17:36:25.1 |
HIP 97419 |
9.01 |
| 2026-02-15 12:00 |
19:47:50.19 |
-17:35:53.1 |
HIP 97419 |
7.49 |
| 2026-02-16 00:00 |
19:48:00.16 |
-17:35:21.0 |
HIP 97419 |
6.56 |
| 2026-02-16 12:00 |
19:48:10.09 |
-17:34:49.0 |
HIP 97419 |
6.45 |
| 2026-02-17 00:00 |
19:48:19.98 |
-17:34:16.9 |
HIP 97419 |
7.21 |
| 2026-02-17 12:00 |
19:48:29.82 |
-17:33:44.9 |
HIP 97419 |
8.60 |
| 2026-02-18 00:00 |
19:48:39.63 |
-17:33:12.8 |
HIP 97419 |
10.35 |
| 2026-02-18 12:00 |
19:48:49.40 |
-17:32:40.8 |
HIP 97419 |
12.32 |
| 2026-02-19 00:00 |
19:48:59.12 |
-17:32:08.8 |
HIP 97419 |
14.41 |
| 2026-02-19 12:00 |
19:49:08.80 |
-17:31:36.8 |
HIP 97419 |
16.56 |
| 2026-02-20 00:00 |
19:49:18.44 |
-17:31:04.8 |
HIP 97419 |
18.76 |
| 2026-02-20 12:00 |
19:49:28.04 |
-17:30:32.8 |
HIP 97419 |
20.98 |
| 2026-02-21 00:00 |
19:49:37.59 |
-17:30:00.9 |
HIP 97419 |
23.22 |
| 2026-02-21 12:00 |
19:49:47.10 |
-17:29:28.9 |
HIP 97419 |
25.46 |
| 2026-02-22 00:00 |
19:49:56.56 |
-17:28:57.0 |
HIP 97419 |
27.71 |
| 2026-02-22 12:00 |
19:50:05.98 |
-17:28:25.1 |
HIP 97740 |
26.68 |
| 2026-02-23 00:00 |
19:50:15.35 |
-17:27:53.2 |
HIP 97740 |
24.46 |
| 2026-02-23 12:00 |
19:50:24.68 |
-17:27:21.4 |
HIP 97740 |
22.27 |
| 2026-02-24 00:00 |
19:50:33.96 |
-17:26:49.6 |
HIP 97740 |
20.10 |