P/2017 G2 (PANSTARRS)
메타데이터
| 항목 |
값 |
| Designation |
P/2017 G2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-06-13T21:56:20.866560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:32Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-05-16.0000000 |
| e |
0.65031280 |
| q (au) |
2.846253 |
| a (au) |
8.139426 |
| i (deg) |
47.906245 |
| Ω (om, deg) |
79.819627 |
| ω (w, deg) |
105.939134 |
| M (ma, deg) |
358.772777 |
밝기
산란 + 전체 선형
$$
M_a = (9.648 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.648 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.539 |
| 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) |
| 2026-02-03 00:00 |
00:55:53.70 |
-44:32:58.2 |
HIP 4309 |
13.18 |
| 2026-02-03 12:00 |
00:56:01.10 |
-44:30:57.5 |
HIP 4309 |
12.48 |
| 2026-02-04 00:00 |
00:56:08.57 |
-44:28:57.1 |
HIP 4309 |
12.24 |
| 2026-02-04 12:00 |
00:56:16.11 |
-44:26:56.9 |
HIP 4309 |
12.48 |
| 2026-02-05 00:00 |
00:56:23.74 |
-44:24:56.9 |
HIP 4309 |
13.18 |
| 2026-02-05 12:00 |
00:56:31.43 |
-44:22:57.2 |
HIP 4309 |
14.28 |
| 2026-02-06 00:00 |
00:56:39.20 |
-44:20:57.8 |
HIP 4309 |
15.69 |
| 2026-02-06 12:00 |
00:56:47.04 |
-44:18:58.6 |
HIP 4309 |
17.34 |
| 2026-02-07 00:00 |
00:56:54.96 |
-44:16:59.7 |
HIP 4537 |
15.55 |
| 2026-02-07 12:00 |
00:57:02.94 |
-44:15:01.0 |
HIP 4537 |
13.27 |
| 2026-02-08 00:00 |
00:57:11.00 |
-44:13:02.6 |
HIP 4537 |
11.04 |
| 2026-02-08 12:00 |
00:57:19.13 |
-44:11:04.5 |
HIP 4537 |
8.91 |
| 2026-02-09 00:00 |
00:57:27.33 |
-44:09:06.7 |
HIP 4537 |
6.99 |
| 2026-02-09 12:00 |
00:57:35.61 |
-44:07:09.2 |
HIP 4537 |
5.48 |
| 2026-02-10 00:00 |
00:57:43.95 |
-44:05:12.0 |
HIP 4537 |
4.82 |
| 2026-02-10 12:00 |
00:57:52.36 |
-44:03:15.1 |
HIP 4537 |
5.33 |
| 2026-02-11 00:00 |
00:58:00.83 |
-44:01:18.5 |
HIP 4537 |
6.75 |
| 2026-02-11 12:00 |
00:58:09.38 |
-43:59:22.3 |
HIP 4537 |
8.66 |
| 2026-02-12 00:00 |
00:58:17.99 |
-43:57:26.3 |
HIP 4537 |
10.79 |
| 2026-02-12 12:00 |
00:58:26.67 |
-43:55:30.7 |
HIP 4537 |
13.04 |
| 2026-02-13 00:00 |
00:58:35.42 |
-43:53:35.4 |
HIP 4537 |
15.37 |
| 2026-02-13 12:00 |
00:58:44.23 |
-43:51:40.5 |
HIP 4537 |
17.73 |
| 2026-02-14 00:00 |
00:58:53.11 |
-43:49:45.9 |
HIP 4537 |
20.13 |
| 2026-02-14 12:00 |
00:59:02.05 |
-43:47:51.7 |
HIP 4537 |
22.54 |
| 2026-02-15 00:00 |
00:59:11.06 |
-43:45:57.8 |
HIP 4528 |
22.60 |
| 2026-02-15 12:00 |
00:59:20.13 |
-43:44:04.3 |
HIP 4528 |
22.14 |
| 2026-02-16 00:00 |
00:59:29.26 |
-43:42:11.1 |
HIP 4528 |
21.98 |
| 2026-02-16 12:00 |
00:59:38.46 |
-43:40:18.3 |
HIP 4528 |
22.11 |
| 2026-02-17 00:00 |
00:59:47.71 |
-43:38:26.0 |
HIP 4528 |
22.54 |
| 2026-02-17 12:00 |
00:59:57.03 |
-43:36:34.0 |
HIP 4528 |
23.25 |
| 2026-02-18 00:00 |
01:00:06.40 |
-43:34:42.3 |
HIP 4607 |
23.00 |
| 2026-02-18 12:00 |
01:00:15.84 |
-43:32:51.1 |
HIP 4607 |
22.39 |
| 2026-02-19 00:00 |
01:00:25.34 |
-43:31:00.3 |
HIP 4607 |
22.07 |
| 2026-02-19 12:00 |
01:00:34.89 |
-43:29:09.9 |
HIP 4607 |
22.05 |
| 2026-02-20 00:00 |
01:00:44.50 |
-43:27:20.0 |
HIP 4607 |
22.33 |
| 2026-02-20 12:00 |
01:00:54.17 |
-43:25:30.4 |
HIP 4607 |
22.90 |
| 2026-02-21 00:00 |
01:01:03.90 |
-43:23:41.3 |
HIP 4607 |
23.74 |
| 2026-02-21 12:00 |
01:01:13.68 |
-43:21:52.6 |
HIP 4607 |
24.83 |
| 2026-02-22 00:00 |
01:01:23.52 |
-43:20:04.3 |
HIP 4607 |
26.13 |
| 2026-02-22 12:00 |
01:01:33.41 |
-43:18:16.5 |
HIP 4607 |
27.62 |
| 2026-02-23 00:00 |
01:01:43.35 |
-43:16:29.1 |
HIP 5006 |
26.18 |
| 2026-02-23 12:00 |
01:01:53.35 |
-43:14:42.2 |
HIP 5006 |
24.55 |
| 2026-02-24 00:00 |
01:02:03.40 |
-43:12:55.7 |
HIP 5006 |
23.07 |