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) |
| 2026-06-01 00:00 |
11:35:36.43 |
-08:54:27.0 |
HIP 56643 |
18.66 |
| 2026-06-01 12:00 |
11:35:36.71 |
-08:53:59.4 |
HIP 56643 |
18.62 |
| 2026-06-02 00:00 |
11:35:37.12 |
-08:53:32.6 |
HIP 56643 |
18.56 |
| 2026-06-02 12:00 |
11:35:37.66 |
-08:53:06.6 |
HIP 56643 |
18.47 |
| 2026-06-03 00:00 |
11:35:38.33 |
-08:52:41.4 |
HIP 56643 |
18.36 |
| 2026-06-03 12:00 |
11:35:39.13 |
-08:52:17.0 |
HIP 56643 |
18.23 |
| 2026-06-04 00:00 |
11:35:40.06 |
-08:51:53.4 |
HIP 56643 |
18.07 |
| 2026-06-04 12:00 |
11:35:41.13 |
-08:51:30.6 |
HIP 56643 |
17.89 |
| 2026-06-05 00:00 |
11:35:42.32 |
-08:51:08.5 |
HIP 56643 |
17.68 |
| 2026-06-05 12:00 |
11:35:43.64 |
-08:50:47.3 |
HIP 56643 |
17.45 |
| 2026-06-06 00:00 |
11:35:45.09 |
-08:50:27.0 |
HIP 56643 |
17.20 |
| 2026-06-06 12:00 |
11:35:46.67 |
-08:50:07.4 |
HIP 56643 |
16.92 |
| 2026-06-07 00:00 |
11:35:48.38 |
-08:49:48.6 |
HIP 56643 |
16.62 |
| 2026-06-07 12:00 |
11:35:50.22 |
-08:49:30.6 |
HIP 56643 |
16.30 |
| 2026-06-08 00:00 |
11:35:52.18 |
-08:49:13.5 |
HIP 56643 |
15.95 |
| 2026-06-08 12:00 |
11:35:54.28 |
-08:48:57.2 |
HIP 56643 |
15.58 |
| 2026-06-09 00:00 |
11:35:56.50 |
-08:48:41.7 |
HIP 56643 |
15.19 |
| 2026-06-09 12:00 |
11:35:58.85 |
-08:48:27.0 |
HIP 56643 |
14.78 |
| 2026-06-10 00:00 |
11:36:01.33 |
-08:48:13.1 |
HIP 56643 |
14.35 |
| 2026-06-10 12:00 |
11:36:03.93 |
-08:48:00.1 |
HIP 56643 |
13.91 |
| 2026-06-11 00:00 |
11:36:06.67 |
-08:47:47.9 |
HIP 56643 |
13.45 |
| 2026-06-11 12:00 |
11:36:09.52 |
-08:47:36.5 |
HIP 56643 |
12.98 |
| 2026-06-12 00:00 |
11:36:12.51 |
-08:47:26.0 |
HIP 56643 |
12.50 |
| 2026-06-12 12:00 |
11:36:15.62 |
-08:47:16.3 |
HIP 56643 |
12.02 |
| 2026-06-13 00:00 |
11:36:18.85 |
-08:47:07.4 |
HIP 56643 |
11.54 |
| 2026-06-13 12:00 |
11:36:22.21 |
-08:46:59.4 |
HIP 56643 |
11.07 |
| 2026-06-14 00:00 |
11:36:25.70 |
-08:46:52.2 |
HIP 56643 |
10.62 |
| 2026-06-14 12:00 |
11:36:29.31 |
-08:46:45.8 |
HIP 56643 |
10.19 |
| 2026-06-15 00:00 |
11:36:33.04 |
-08:46:40.3 |
HIP 56643 |
9.79 |
| 2026-06-15 12:00 |
11:36:36.90 |
-08:46:35.6 |
HIP 56643 |
9.45 |
| 2026-06-16 00:00 |
11:36:40.88 |
-08:46:31.7 |
HIP 56643 |
9.17 |
| 2026-06-16 12:00 |
11:36:44.98 |
-08:46:28.7 |
HIP 56643 |
8.97 |
| 2026-06-17 00:00 |
11:36:49.21 |
-08:46:26.5 |
HIP 56643 |
8.86 |
| 2026-06-17 12:00 |
11:36:53.56 |
-08:46:25.2 |
HIP 56643 |
8.87 |
| 2026-06-18 00:00 |
11:36:58.02 |
-08:46:24.7 |
HIP 56643 |
9.00 |
| 2026-06-18 12:00 |
11:37:02.61 |
-08:46:25.1 |
HIP 56643 |
9.25 |
| 2026-06-19 00:00 |
11:37:07.32 |
-08:46:26.3 |
HIP 56643 |
9.63 |
| 2026-06-19 12:00 |
11:37:12.15 |
-08:46:28.3 |
HIP 56643 |
10.13 |
| 2026-06-20 00:00 |
11:37:17.10 |
-08:46:31.2 |
HIP 56643 |
10.75 |
| 2026-06-20 12:00 |
11:37:22.17 |
-08:46:34.9 |
HIP 56643 |
11.47 |
| 2026-06-21 00:00 |
11:37:27.35 |
-08:46:39.4 |
HIP 56643 |
12.29 |
| 2026-06-21 12:00 |
11:37:32.65 |
-08:46:44.8 |
HIP 56643 |
13.19 |
| 2026-06-22 00:00 |
11:37:38.07 |
-08:46:51.0 |
HIP 56643 |
14.18 |