P/2020 G1 (Pimentel)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | P/2020 G1 (Pimentel) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-03-17T09:47:11.889600Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:34:05Z |
| Obs used | 490 |
| NEO | Yes |
| M1 | 17.400 |
| K1 | 4.500 |
| PC | 0.030 |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-05-04.0000000 |
| e | 0.85961155 |
| q (au) | 0.505764 |
| a (au) | 3.602603 |
| i (deg) | 18.472732 |
| Ω (om, deg) | 240.105496 |
| ω (w, deg) | 207.637592 |
| M (ma, deg) | 6.859863 |
밝기
산란 + 전체 선형
$$ M_a = (17.331 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 17.331 |
| n | 2.000 |
| gf | 0.800 |
| gb | -0.696 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) | 끝 (UTC) | a | b |
|---|---|---|---|
| 2020-04-13 | 2020-04-29 | +4.8811 | +0.451 |
| 2020-04-29 | 2020-05-31 | -5.2578 | +0.285 |
| 2020-05-31 | 2020-07-19 | +18.1081 | -3.892 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 19:10:48.90 | +03:55:54.5 | HIP 94268 | 16.90 |
| 2026-09-20 12:00 | 19:10:28.36 | +03:50:41.5 | HIP 94215 | 19.48 |
| 2026-09-21 00:00 | 19:10:08.41 | +03:45:28.2 | HIP 94215 | 16.85 |
| 2026-09-21 12:00 | 19:09:49.05 | +03:40:14.6 | HIP 94215 | 16.97 |
| 2026-09-22 00:00 | 19:09:30.28 | +03:35:00.7 | HIP 94189 | 17.50 |
| 2026-09-22 12:00 | 19:09:12.11 | +03:29:46.6 | HIP 94189 | 20.35 |
| 2026-09-23 00:00 | 19:08:54.53 | +03:24:32.3 | HIP 93904 | 24.14 |
| 2026-09-23 12:00 | 19:08:37.55 | +03:19:17.9 | HIP 93904 | 21.11 |
| 2026-09-24 00:00 | 19:08:21.16 | +03:14:03.4 | HIP 93904 | 20.10 |
| 2026-09-24 12:00 | 19:08:05.37 | +03:08:48.9 | HIP 93904 | 21.32 |
| 2026-09-25 00:00 | 19:07:50.18 | +03:03:34.3 | HIP 93904 | 24.36 |
| 2026-09-25 12:00 | 19:07:35.57 | +02:58:19.8 | HIP 93904 | 28.58 |
| 2026-09-26 00:00 | 19:07:21.57 | +02:53:05.4 | HIP 93796 | 29.76 |
| 2026-09-26 12:00 | 19:07:08.16 | +02:47:51.1 | HIP 93796 | 32.20 |
| 2026-09-27 00:00 | 19:06:55.35 | +02:42:37.0 | HIP 93949 | 29.20 |
| 2026-09-27 12:00 | 19:06:43.14 | +02:37:23.1 | HIP 93949 | 26.25 |
| 2026-09-28 00:00 | 19:06:31.52 | +02:32:09.4 | HIP 93949 | 24.37 |
| 2026-09-28 12:00 | 19:06:20.50 | +02:26:56.0 | HIP 93949 | 23.74 |
| 2026-09-29 00:00 | 19:06:10.07 | +02:21:42.8 | HIP 93949 | 24.42 |
| 2026-09-29 12:00 | 19:06:00.25 | +02:16:30.1 | HIP 93949 | 26.25 |
| 2026-09-30 00:00 | 19:05:51.01 | +02:11:17.7 | HIP 93949 | 28.98 |
| 2026-09-30 12:00 | 19:05:42.38 | +02:06:05.7 | HIP 93949 | 32.34 |
| 2026-10-01 00:00 | 19:05:34.34 | +02:00:54.1 | HIP 93580 | 32.70 |
| 2026-10-01 12:00 | 19:05:26.89 | +01:55:43.1 | HIP 93580 | 29.39 |
| 2026-10-02 00:00 | 19:05:20.04 | +01:50:32.5 | HIP 93840 | 26.97 |
| 2026-10-02 12:00 | 19:05:13.79 | +01:45:22.5 | HIP 93840 | 24.85 |
| 2026-10-03 00:00 | 19:05:08.13 | +01:40:13.0 | HIP 93681 | 23.00 |
| 2026-10-03 12:00 | 19:05:03.07 | +01:35:04.2 | HIP 93681 | 17.72 |
| 2026-10-04 00:00 | 19:04:58.60 | +01:29:56.0 | HIP 93681 | 12.52 |
| 2026-10-04 12:00 | 19:04:54.73 | +01:24:48.5 | HIP 93681 | 7.49 |
| 2026-10-05 00:00 | 19:04:51.45 | +01:19:41.6 | HIP 93681 | 3.29 |
| 2026-10-05 12:00 | 19:04:48.76 | +01:14:35.5 | HIP 93681 | 4.44 |
| 2026-10-06 00:00 | 19:04:46.67 | +01:09:30.2 | HIP 93681 | 9.05 |
| 2026-10-06 12:00 | 19:04:45.17 | +01:04:25.6 | HIP 93681 | 14.02 |
| 2026-10-07 00:00 | 19:04:44.26 | +00:59:21.9 | HIP 93681 | 19.04 |
| 2026-10-07 12:00 | 19:04:43.94 | +00:54:19.0 | HIP 93681 | 24.08 |
| 2026-10-08 00:00 | 19:04:44.21 | +00:49:17.0 | HIP 93557 | 25.82 |
| 2026-10-08 12:00 | 19:04:45.07 | +00:44:15.9 | HIP 93557 | 23.52 |
| 2026-10-09 00:00 | 19:04:46.52 | +00:39:15.7 | HIP 93557 | 22.29 |
| 2026-10-09 12:00 | 19:04:48.56 | +00:34:16.5 | HIP 93714 | 20.38 |
| 2026-10-10 00:00 | 19:04:51.18 | +00:29:18.3 | HIP 93714 | 15.37 |
| 2026-10-10 12:00 | 19:04:54.38 | +00:24:21.1 | HIP 93714 | 10.38 |
| 2026-10-11 00:00 | 19:04:58.17 | +00:19:25.0 | HIP 93714 | 5.48 |