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) |
| 2026-03-26 00:00 |
01:13:20.54 |
-41:42:52.1 |
HIP 5802 |
16.16 |
| 2026-03-26 12:00 |
01:13:32.70 |
-41:41:40.9 |
HIP 5802 |
15.45 |
| 2026-03-27 00:00 |
01:13:44.88 |
-41:40:30.4 |
HIP 5802 |
15.13 |
| 2026-03-27 12:00 |
01:13:57.07 |
-41:39:20.6 |
HIP 5802 |
15.23 |
| 2026-03-28 00:00 |
01:14:09.27 |
-41:38:11.4 |
HIP 5802 |
15.74 |
| 2026-03-28 12:00 |
01:14:21.49 |
-41:37:03.0 |
HIP 5802 |
16.61 |
| 2026-03-29 00:00 |
01:14:33.72 |
-41:35:55.3 |
HIP 5802 |
17.80 |
| 2026-03-29 12:00 |
01:14:45.97 |
-41:34:48.2 |
HIP 5802 |
19.24 |
| 2026-03-30 00:00 |
01:14:58.23 |
-41:33:41.9 |
HIP 5802 |
20.88 |
| 2026-03-30 12:00 |
01:15:10.50 |
-41:32:36.3 |
HIP 5802 |
22.68 |
| 2026-03-31 00:00 |
01:15:22.79 |
-41:31:31.3 |
HIP 5802 |
24.60 |
| 2026-03-31 12:00 |
01:15:35.08 |
-41:30:27.1 |
HIP 5962 |
23.31 |
| 2026-04-01 00:00 |
01:15:47.39 |
-41:29:23.6 |
HIP 5962 |
21.22 |
| 2026-04-01 12:00 |
01:15:59.70 |
-41:28:20.8 |
HIP 5962 |
19.24 |
| 2026-04-02 00:00 |
01:16:12.03 |
-41:27:18.8 |
HIP 5962 |
17.42 |
| 2026-04-02 12:00 |
01:16:24.37 |
-41:26:17.4 |
HIP 5962 |
15.82 |
| 2026-04-03 00:00 |
01:16:36.71 |
-41:25:16.8 |
HIP 5962 |
14.49 |
| 2026-04-03 12:00 |
01:16:49.06 |
-41:24:16.9 |
HIP 5962 |
13.52 |
| 2026-04-04 00:00 |
01:17:01.42 |
-41:23:17.7 |
HIP 6066 |
12.43 |
| 2026-04-04 12:00 |
01:17:13.79 |
-41:22:19.2 |
HIP 6066 |
10.08 |
| 2026-04-05 00:00 |
01:17:26.16 |
-41:21:21.5 |
HIP 6066 |
7.85 |
| 2026-04-05 12:00 |
01:17:38.55 |
-41:20:24.5 |
HIP 6066 |
5.86 |
| 2026-04-06 00:00 |
01:17:50.93 |
-41:19:28.2 |
HIP 6066 |
4.44 |
| 2026-04-06 12:00 |
01:18:03.32 |
-41:18:32.7 |
HIP 6066 |
4.22 |
| 2026-04-07 00:00 |
01:18:15.72 |
-41:17:37.9 |
HIP 6066 |
5.35 |
| 2026-04-07 12:00 |
01:18:28.12 |
-41:16:43.8 |
HIP 6066 |
7.21 |
| 2026-04-08 00:00 |
01:18:40.52 |
-41:15:50.5 |
HIP 6066 |
9.37 |
| 2026-04-08 12:00 |
01:18:52.93 |
-41:14:58.0 |
HIP 6066 |
11.67 |
| 2026-04-09 00:00 |
01:19:05.34 |
-41:14:06.2 |
HIP 6066 |
14.03 |
| 2026-04-09 12:00 |
01:19:17.75 |
-41:13:15.1 |
HIP 6066 |
16.43 |
| 2026-04-10 00:00 |
01:19:30.17 |
-41:12:24.8 |
HIP 6066 |
18.85 |
| 2026-04-10 12:00 |
01:19:42.58 |
-41:11:35.3 |
HIP 6066 |
21.29 |
| 2026-04-11 00:00 |
01:19:55.00 |
-41:10:46.5 |
HIP 6343 |
21.73 |
| 2026-04-11 12:00 |
01:20:07.41 |
-41:09:58.5 |
HIP 6343 |
19.37 |
| 2026-04-12 00:00 |
01:20:19.83 |
-41:09:11.2 |
HIP 6343 |
17.05 |
| 2026-04-12 12:00 |
01:20:32.24 |
-41:08:24.7 |
HIP 6343 |
14.78 |
| 2026-04-13 00:00 |
01:20:44.65 |
-41:07:39.0 |
HIP 6343 |
12.60 |
| 2026-04-13 12:00 |
01:20:57.06 |
-41:06:54.1 |
HIP 6343 |
10.55 |
| 2026-04-14 00:00 |
01:21:09.47 |
-41:06:09.9 |
HIP 6343 |
8.73 |
| 2026-04-14 12:00 |
01:21:21.87 |
-41:05:26.5 |
HIP 6343 |
7.29 |
| 2026-04-15 00:00 |
01:21:34.27 |
-41:04:43.9 |
HIP 6343 |
6.51 |
| 2026-04-15 12:00 |
01:21:46.66 |
-41:04:02.1 |
HIP 6343 |
6.60 |
| 2026-04-16 00:00 |
01:21:59.05 |
-41:03:21.1 |
HIP 6343 |
7.54 |