메타데이터
| 항목 |
값 |
| Designation |
C/2020 S2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-12-21T22:27:29.819520Z |
| Orbit solution date (soln_date, UTC) |
2022-09-27T15:42:34Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
13.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-09-16T07:49:20.697600Z |
| Discovery magnitude (MPC) |
20.75 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-10-15.0000000 |
| e |
0.82748820 |
| q (au) |
1.756056 |
| a (au) |
10.179340 |
| i (deg) |
22.397832 |
| Ω (om, deg) |
197.685362 |
| ω (w, deg) |
202.263038 |
| M (ma, deg) |
357.938311 |
밝기
산란 + 전체 선형
$$
M_a = (15.508 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.508 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
1.000 |
| 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 |
12:49:04.39 |
-07:20:28.2 |
HIP 62632 |
16.63 |
| 2026-03-26 12:00 |
12:48:56.27 |
-07:19:28.6 |
HIP 62632 |
17.94 |
| 2026-03-27 00:00 |
12:48:48.15 |
-07:18:28.9 |
HIP 62632 |
19.42 |
| 2026-03-27 12:00 |
12:48:40.01 |
-07:17:29.0 |
HIP 62632 |
21.04 |
| 2026-03-28 00:00 |
12:48:31.86 |
-07:16:29.1 |
HIP 62632 |
22.76 |
| 2026-03-28 12:00 |
12:48:23.71 |
-07:15:29.1 |
HIP 62632 |
24.58 |
| 2026-03-29 00:00 |
12:48:15.55 |
-07:14:28.9 |
HIP 62632 |
26.46 |
| 2026-03-29 12:00 |
12:48:07.39 |
-07:13:28.7 |
HIP 62632 |
28.40 |
| 2026-03-30 00:00 |
12:47:59.22 |
-07:12:28.3 |
HIP 62632 |
30.39 |
| 2026-03-30 12:00 |
12:47:51.05 |
-07:11:27.9 |
HIP 62632 |
32.41 |
| 2026-03-31 00:00 |
12:47:42.87 |
-07:10:27.4 |
HIP 62632 |
34.46 |
| 2026-03-31 12:00 |
12:47:34.70 |
-07:09:26.9 |
HIP 62605 |
35.86 |
| 2026-04-01 00:00 |
12:47:26.52 |
-07:08:26.2 |
HIP 62605 |
37.24 |
| 2026-04-01 12:00 |
12:47:18.34 |
-07:07:25.6 |
HIP 62605 |
38.69 |
| 2026-04-02 00:00 |
12:47:10.16 |
-07:06:24.8 |
HIP 62605 |
40.23 |
| 2026-04-02 12:00 |
12:47:01.98 |
-07:05:24.0 |
HIP 62605 |
41.83 |
| 2026-04-03 00:00 |
12:46:53.81 |
-07:04:23.2 |
HIP 62605 |
43.48 |
| 2026-04-03 12:00 |
12:46:45.64 |
-07:03:22.3 |
HIP 62153 |
44.48 |
| 2026-04-04 00:00 |
12:46:37.47 |
-07:02:21.4 |
HIP 62153 |
43.45 |
| 2026-04-04 12:00 |
12:46:29.31 |
-07:01:20.4 |
HIP 62153 |
42.53 |
| 2026-04-05 00:00 |
12:46:21.15 |
-07:00:19.5 |
HIP 62153 |
41.71 |
| 2026-04-05 12:00 |
12:46:13.00 |
-06:59:18.5 |
HIP 62153 |
41.00 |
| 2026-04-06 00:00 |
12:46:04.85 |
-06:58:17.5 |
HIP 62153 |
40.40 |
| 2026-04-06 12:00 |
12:45:56.72 |
-06:57:16.5 |
HIP 62153 |
39.92 |
| 2026-04-07 00:00 |
12:45:48.59 |
-06:56:15.5 |
HIP 62153 |
39.57 |
| 2026-04-07 12:00 |
12:45:40.47 |
-06:55:14.5 |
HIP 62153 |
39.35 |
| 2026-04-08 00:00 |
12:45:32.36 |
-06:54:13.5 |
HIP 62153 |
39.26 |
| 2026-04-08 12:00 |
12:45:24.27 |
-06:53:12.5 |
HIP 62153 |
39.29 |
| 2026-04-09 00:00 |
12:45:16.18 |
-06:52:11.6 |
HIP 62153 |
39.46 |
| 2026-04-09 12:00 |
12:45:08.11 |
-06:51:10.7 |
HIP 62153 |
39.75 |
| 2026-04-10 00:00 |
12:45:00.06 |
-06:50:09.8 |
HIP 62190 |
40.01 |
| 2026-04-10 12:00 |
12:44:52.02 |
-06:49:08.9 |
HIP 62190 |
38.84 |
| 2026-04-11 00:00 |
12:44:43.99 |
-06:48:08.1 |
HIP 62190 |
37.77 |
| 2026-04-11 12:00 |
12:44:35.98 |
-06:47:07.4 |
HIP 62190 |
36.81 |
| 2026-04-12 00:00 |
12:44:27.99 |
-06:46:06.7 |
HIP 62190 |
35.95 |
| 2026-04-12 12:00 |
12:44:20.02 |
-06:45:06.0 |
HIP 62190 |
35.22 |
| 2026-04-13 00:00 |
12:44:12.06 |
-06:44:05.5 |
HIP 62190 |
34.62 |
| 2026-04-13 12:00 |
12:44:04.13 |
-06:43:05.0 |
HIP 62190 |
34.15 |
| 2026-04-14 00:00 |
12:43:56.21 |
-06:42:04.6 |
HIP 62190 |
33.82 |
| 2026-04-14 12:00 |
12:43:48.32 |
-06:41:04.2 |
HIP 62190 |
33.63 |
| 2026-04-15 00:00 |
12:43:40.45 |
-06:40:04.0 |
HIP 61949 |
31.84 |
| 2026-04-15 12:00 |
12:43:32.60 |
-06:39:03.9 |
HIP 61949 |
29.65 |
| 2026-04-16 00:00 |
12:43:24.78 |
-06:38:03.8 |
HIP 61949 |
27.46 |