메타데이터
| 항목 |
값 |
| Designation |
P/2020 S7 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-18T00:51:10.647360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:12Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-16T08:31:24.960000Z |
| Discovery magnitude (MPC) |
20.80 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-09-29.0000000 |
| e |
0.41057912 |
| q (au) |
2.961017 |
| a (au) |
5.023604 |
| i (deg) |
16.091824 |
| Ω (om, deg) |
328.018227 |
| ω (w, deg) |
40.397306 |
| M (ma, deg) |
355.620147 |
밝기
산란 + 전체 선형
$$
M_a = (11.343 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.343 |
| n |
6.000 |
| gf |
0.984 |
| gb |
-0.955 |
| k |
1.000 |
| δ90 |
6.701 |
| 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 |
11:49:03.70 |
-09:31:14.1 |
HIP 57599 |
11.86 |
| 2026-07-29 12:00 |
11:49:16.26 |
-09:32:17.9 |
HIP 57599 |
14.83 |
| 2026-07-30 00:00 |
11:49:28.90 |
-09:33:22.4 |
HIP 57599 |
17.93 |
| 2026-07-30 12:00 |
11:49:41.61 |
-09:34:27.5 |
HIP 57763 |
18.71 |
| 2026-07-31 00:00 |
11:49:54.39 |
-09:35:33.3 |
HIP 57763 |
16.95 |
| 2026-07-31 12:00 |
11:50:07.25 |
-09:36:39.8 |
HIP 57763 |
15.71 |
| 2026-08-01 00:00 |
11:50:20.17 |
-09:37:46.9 |
HIP 57763 |
15.13 |
| 2026-08-01 12:00 |
11:50:33.17 |
-09:38:54.7 |
HIP 57763 |
15.31 |
| 2026-08-02 00:00 |
11:50:46.23 |
-09:40:03.2 |
HIP 57763 |
16.22 |
| 2026-08-02 12:00 |
11:50:59.36 |
-09:41:12.3 |
HIP 57758 |
16.20 |
| 2026-08-03 00:00 |
11:51:12.57 |
-09:42:22.0 |
HIP 57758 |
16.30 |
| 2026-08-03 12:00 |
11:51:25.83 |
-09:43:32.4 |
HIP 57816 |
15.12 |
| 2026-08-04 00:00 |
11:51:39.17 |
-09:44:43.5 |
HIP 57816 |
14.59 |
| 2026-08-04 12:00 |
11:51:52.58 |
-09:45:55.2 |
HIP 57816 |
14.89 |
| 2026-08-05 00:00 |
11:52:06.05 |
-09:47:07.5 |
HIP 57816 |
15.97 |
| 2026-08-05 12:00 |
11:52:19.58 |
-09:48:20.5 |
HIP 57816 |
17.71 |
| 2026-08-06 00:00 |
11:52:33.18 |
-09:49:34.1 |
HIP 57816 |
19.95 |
| 2026-08-06 12:00 |
11:52:46.85 |
-09:50:48.3 |
HIP 57816 |
22.54 |
| 2026-08-07 00:00 |
11:53:00.58 |
-09:52:03.2 |
HIP 58072 |
25.01 |
| 2026-08-07 12:00 |
11:53:14.38 |
-09:53:18.7 |
HIP 58072 |
22.44 |
| 2026-08-08 00:00 |
11:53:28.23 |
-09:54:34.8 |
HIP 58072 |
20.18 |
| 2026-08-08 12:00 |
11:53:42.15 |
-09:55:51.5 |
HIP 58072 |
18.37 |
| 2026-08-09 00:00 |
11:53:56.14 |
-09:57:08.9 |
HIP 58072 |
17.15 |
| 2026-08-09 12:00 |
11:54:10.18 |
-09:58:26.8 |
HIP 58072 |
16.69 |
| 2026-08-10 00:00 |
11:54:24.29 |
-09:59:45.4 |
HIP 58072 |
17.03 |
| 2026-08-10 12:00 |
11:54:38.45 |
-10:01:04.6 |
HIP 58072 |
18.16 |
| 2026-08-11 00:00 |
11:54:52.68 |
-10:02:24.4 |
HIP 58072 |
19.95 |
| 2026-08-11 12:00 |
11:55:06.97 |
-10:03:44.9 |
HIP 58072 |
22.24 |
| 2026-08-12 00:00 |
11:55:21.31 |
-10:05:05.9 |
HIP 58072 |
24.91 |
| 2026-08-12 12:00 |
11:55:35.71 |
-10:06:27.5 |
HIP 58072 |
27.86 |
| 2026-08-13 00:00 |
11:55:50.17 |
-10:07:49.7 |
HIP 58336 |
28.95 |
| 2026-08-13 12:00 |
11:56:04.69 |
-10:09:12.5 |
HIP 58336 |
25.33 |
| 2026-08-14 00:00 |
11:56:19.26 |
-10:10:35.9 |
HIP 58336 |
21.77 |
| 2026-08-14 12:00 |
11:56:33.89 |
-10:11:59.8 |
HIP 58336 |
18.32 |
| 2026-08-15 00:00 |
11:56:48.57 |
-10:13:24.4 |
HIP 58336 |
15.05 |
| 2026-08-15 12:00 |
11:57:03.31 |
-10:14:49.5 |
HIP 58336 |
12.15 |
| 2026-08-16 00:00 |
11:57:18.10 |
-10:16:15.2 |
HIP 58336 |
9.95 |
| 2026-08-16 12:00 |
11:57:32.94 |
-10:17:41.4 |
HIP 58336 |
8.99 |
| 2026-08-17 00:00 |
11:57:47.84 |
-10:19:08.2 |
HIP 58336 |
9.68 |
| 2026-08-17 12:00 |
11:58:02.79 |
-10:20:35.6 |
HIP 58336 |
11.75 |
| 2026-08-18 00:00 |
11:58:17.78 |
-10:22:03.5 |
HIP 58450 |
14.25 |
| 2026-08-18 12:00 |
11:58:32.83 |
-10:23:32.0 |
HIP 58450 |
10.29 |
| 2026-08-19 00:00 |
11:58:47.93 |
-10:25:01.0 |
HIP 58450 |
6.35 |