메타데이터
| 항목 |
값 |
| Designation |
C/2017 C2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-21T14:49:52.703040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:30Z |
| Obs used |
97 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
13.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-03-11.0000000 |
| e |
0.97530974 |
| q (au) |
2.430997 |
| a (au) |
98.459722 |
| i (deg) |
118.583896 |
| Ω (om, deg) |
249.819140 |
| ω (w, deg) |
138.775813 |
| M (ma, deg) |
0.048809 |
밝기
산란 + 전체 선형
$$
M_a = (10.786 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.786 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.999 |
| 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) |
| 2026-06-01 00:00 |
00:31:13.98 |
-67:08:25.1 |
HIP 2662 |
21.66 |
| 2026-06-01 12:00 |
00:31:18.75 |
-67:09:31.3 |
HIP 2662 |
20.53 |
| 2026-06-02 00:00 |
00:31:23.43 |
-67:10:38.0 |
HIP 2662 |
19.41 |
| 2026-06-02 12:00 |
00:31:28.03 |
-67:11:45.0 |
HIP 2662 |
18.30 |
| 2026-06-03 00:00 |
00:31:32.54 |
-67:12:52.3 |
HIP 2662 |
17.21 |
| 2026-06-03 12:00 |
00:31:36.96 |
-67:14:00.1 |
HIP 2662 |
16.14 |
| 2026-06-04 00:00 |
00:31:41.30 |
-67:15:08.2 |
HIP 2662 |
15.09 |
| 2026-06-04 12:00 |
00:31:45.54 |
-67:16:16.6 |
HIP 2662 |
14.07 |
| 2026-06-05 00:00 |
00:31:49.70 |
-67:17:25.5 |
HIP 2662 |
13.09 |
| 2026-06-05 12:00 |
00:31:53.76 |
-67:18:34.6 |
HIP 2662 |
12.15 |
| 2026-06-06 00:00 |
00:31:57.74 |
-67:19:44.1 |
HIP 2662 |
11.27 |
| 2026-06-06 12:00 |
00:32:01.62 |
-67:20:54.0 |
HIP 2662 |
10.48 |
| 2026-06-07 00:00 |
00:32:05.41 |
-67:22:04.2 |
HIP 2662 |
9.77 |
| 2026-06-07 12:00 |
00:32:09.11 |
-67:23:14.7 |
HIP 2662 |
9.19 |
| 2026-06-08 00:00 |
00:32:12.72 |
-67:24:25.6 |
HIP 2662 |
8.75 |
| 2026-06-08 12:00 |
00:32:16.23 |
-67:25:36.8 |
HIP 2662 |
8.47 |
| 2026-06-09 00:00 |
00:32:19.65 |
-67:26:48.3 |
HIP 2662 |
8.39 |
| 2026-06-09 12:00 |
00:32:22.98 |
-67:28:00.2 |
HIP 2662 |
8.49 |
| 2026-06-10 00:00 |
00:32:26.21 |
-67:29:12.3 |
HIP 2662 |
8.78 |
| 2026-06-10 12:00 |
00:32:29.34 |
-67:30:24.8 |
HIP 2662 |
9.24 |
| 2026-06-11 00:00 |
00:32:32.37 |
-67:31:37.5 |
HIP 2662 |
9.85 |
| 2026-06-11 12:00 |
00:32:35.31 |
-67:32:50.6 |
HIP 2662 |
10.58 |
| 2026-06-12 00:00 |
00:32:38.16 |
-67:34:04.0 |
HIP 2662 |
11.41 |
| 2026-06-12 12:00 |
00:32:40.90 |
-67:35:17.6 |
HIP 2662 |
12.33 |
| 2026-06-13 00:00 |
00:32:43.54 |
-67:36:31.6 |
HIP 2662 |
13.30 |
| 2026-06-13 12:00 |
00:32:46.09 |
-67:37:45.8 |
HIP 2662 |
14.33 |
| 2026-06-14 00:00 |
00:32:48.53 |
-67:39:00.3 |
HIP 2662 |
15.40 |
| 2026-06-14 12:00 |
00:32:50.88 |
-67:40:15.1 |
HIP 2662 |
16.51 |
| 2026-06-15 00:00 |
00:32:53.12 |
-67:41:30.1 |
HIP 2662 |
17.64 |
| 2026-06-15 12:00 |
00:32:55.26 |
-67:42:45.4 |
HIP 2556 |
17.88 |
| 2026-06-16 00:00 |
00:32:57.30 |
-67:44:01.0 |
HIP 2556 |
16.66 |
| 2026-06-16 12:00 |
00:32:59.24 |
-67:45:16.8 |
HIP 2556 |
15.45 |
| 2026-06-17 00:00 |
00:33:01.07 |
-67:46:32.8 |
HIP 2556 |
14.24 |
| 2026-06-17 12:00 |
00:33:02.80 |
-67:47:49.1 |
HIP 2556 |
13.04 |
| 2026-06-18 00:00 |
00:33:04.42 |
-67:49:05.7 |
HIP 2556 |
11.85 |
| 2026-06-18 12:00 |
00:33:05.94 |
-67:50:22.4 |
HIP 2556 |
10.68 |
| 2026-06-19 00:00 |
00:33:07.36 |
-67:51:39.4 |
HIP 2556 |
9.53 |
| 2026-06-19 12:00 |
00:33:08.66 |
-67:52:56.6 |
HIP 2556 |
8.41 |
| 2026-06-20 00:00 |
00:33:09.87 |
-67:54:14.0 |
HIP 2556 |
7.33 |
| 2026-06-20 12:00 |
00:33:10.96 |
-67:55:31.6 |
HIP 2556 |
6.34 |
| 2026-06-21 00:00 |
00:33:11.95 |
-67:56:49.4 |
HIP 2556 |
5.46 |
| 2026-06-21 12:00 |
00:33:12.84 |
-67:58:07.4 |
HIP 2556 |
4.76 |
| 2026-06-22 00:00 |
00:33:13.61 |
-67:59:25.6 |
HIP 2556 |
4.35 |