메타데이터
| 항목 |
값 |
| Designation |
C/2017 S2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-08-29T08:08:37.178880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:35Z |
| Obs used |
67 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
19.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-10-10.0000000 |
| e |
0.82311096 |
| q (au) |
3.614508 |
| a (au) |
20.433760 |
| i (deg) |
12.683350 |
| Ω (om, deg) |
62.427792 |
| ω (w, deg) |
305.972876 |
| M (ma, deg) |
0.444537 |
밝기
산란 + 전체 선형
$$
M_a = (13.505 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.505 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.753 |
| 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) |
| 2026-07-29 00:00 |
10:15:28.19 |
+23:41:12.8 |
HIP 50319 |
18.39 |
| 2026-07-29 12:00 |
10:15:34.82 |
+23:40:30.2 |
HIP 50319 |
16.75 |
| 2026-07-30 00:00 |
10:15:41.46 |
+23:39:47.6 |
HIP 50319 |
15.12 |
| 2026-07-30 12:00 |
10:15:48.13 |
+23:39:05.1 |
HIP 50319 |
13.50 |
| 2026-07-31 00:00 |
10:15:54.81 |
+23:38:22.6 |
HIP 50319 |
11.89 |
| 2026-07-31 12:00 |
10:16:01.51 |
+23:37:40.1 |
HIP 50319 |
10.31 |
| 2026-08-01 00:00 |
10:16:08.23 |
+23:36:57.7 |
HIP 50319 |
8.76 |
| 2026-08-01 12:00 |
10:16:14.97 |
+23:36:15.3 |
HIP 50319 |
7.27 |
| 2026-08-02 00:00 |
10:16:21.72 |
+23:35:33.0 |
HIP 50319 |
5.90 |
| 2026-08-02 12:00 |
10:16:28.49 |
+23:34:50.8 |
HIP 50319 |
4.75 |
| 2026-08-03 00:00 |
10:16:35.27 |
+23:34:08.6 |
HIP 50319 |
4.02 |
| 2026-08-03 12:00 |
10:16:42.07 |
+23:33:26.5 |
HIP 50319 |
3.94 |
| 2026-08-04 00:00 |
10:16:48.89 |
+23:32:44.4 |
HIP 50319 |
4.56 |
| 2026-08-04 12:00 |
10:16:55.72 |
+23:32:02.4 |
HIP 50319 |
5.66 |
| 2026-08-05 00:00 |
10:17:02.57 |
+23:31:20.5 |
HIP 50319 |
7.01 |
| 2026-08-05 12:00 |
10:17:09.43 |
+23:30:38.6 |
HIP 50319 |
8.50 |
| 2026-08-06 00:00 |
10:17:16.30 |
+23:29:56.8 |
HIP 50335 |
9.39 |
| 2026-08-06 12:00 |
10:17:23.19 |
+23:29:15.0 |
HIP 50335 |
10.47 |
| 2026-08-07 00:00 |
10:17:30.09 |
+23:28:33.4 |
HIP 50335 |
11.71 |
| 2026-08-07 12:00 |
10:17:37.00 |
+23:27:51.8 |
HIP 50335 |
13.06 |
| 2026-08-08 00:00 |
10:17:43.93 |
+23:27:10.3 |
HIP 50394 |
13.87 |
| 2026-08-08 12:00 |
10:17:50.87 |
+23:26:28.8 |
HIP 50394 |
13.82 |
| 2026-08-09 00:00 |
10:17:57.82 |
+23:25:47.5 |
HIP 50394 |
13.99 |
| 2026-08-09 12:00 |
10:18:04.79 |
+23:25:06.2 |
HIP 50394 |
14.37 |
| 2026-08-10 00:00 |
10:18:11.76 |
+23:24:25.0 |
HIP 50394 |
14.95 |
| 2026-08-10 12:00 |
10:18:18.75 |
+23:23:43.9 |
HIP 50394 |
15.71 |
| 2026-08-11 00:00 |
10:18:25.74 |
+23:23:02.9 |
HIP 50394 |
16.62 |
| 2026-08-11 12:00 |
10:18:32.75 |
+23:22:22.0 |
HIP 50394 |
17.66 |
| 2026-08-12 00:00 |
10:18:39.76 |
+23:21:41.2 |
HIP 50394 |
18.80 |
| 2026-08-12 12:00 |
10:18:46.79 |
+23:21:00.4 |
HIP 50394 |
20.04 |
| 2026-08-13 00:00 |
10:18:53.82 |
+23:20:19.8 |
HIP 50394 |
21.35 |
| 2026-08-13 12:00 |
10:19:00.87 |
+23:19:39.3 |
HIP 50394 |
22.72 |
| 2026-08-14 00:00 |
10:19:07.92 |
+23:18:58.9 |
HIP 50394 |
24.15 |
| 2026-08-14 12:00 |
10:19:14.98 |
+23:18:18.6 |
HIP 50394 |
25.61 |
| 2026-08-15 00:00 |
10:19:22.04 |
+23:17:38.4 |
HIP 50394 |
27.12 |
| 2026-08-15 12:00 |
10:19:29.11 |
+23:16:58.3 |
HIP 50394 |
28.65 |
| 2026-08-16 00:00 |
10:19:36.19 |
+23:16:18.3 |
HIP 50394 |
30.21 |
| 2026-08-16 12:00 |
10:19:43.28 |
+23:15:38.5 |
HIP 50394 |
31.80 |
| 2026-08-17 00:00 |
10:19:50.37 |
+23:14:58.7 |
HIP 50394 |
33.40 |
| 2026-08-17 12:00 |
10:19:57.47 |
+23:14:19.1 |
HIP 50394 |
35.02 |
| 2026-08-18 00:00 |
10:20:04.57 |
+23:13:39.6 |
HIP 50394 |
36.65 |
| 2026-08-18 12:00 |
10:20:11.68 |
+23:13:00.2 |
HIP 50394 |
38.30 |
| 2026-08-19 00:00 |
10:20:18.79 |
+23:12:21.0 |
HIP 50856 |
38.25 |