C/2022 U1 (Leonard)
메타데이터
| 항목 | 값 |
|---|---|
| Designation | C/2022 U1 (Leonard) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-03-25T21:34:52.720320Z |
| Orbit solution date (soln_date, UTC) | 2025-10-28T16:12:34Z |
| Obs used | 1325 |
| NEO | - |
| M1 | 10.200 |
| K1 | 7.000 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2022-10-20T08:05:31.920000Z |
| Discovery magnitude (MPC) | 19.84 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-05-01.0000000 |
| e | 0.99936570 |
| q (au) | 4.202017 |
| a (au) | 6624.693105 |
| i (deg) | 128.149455 |
| Ω (om, deg) | 72.526035 |
| ω (w, deg) | 78.588952 |
| M (ma, deg) | 0.000066 |
밝기
산란 + 전체 선형
$$ M_a = (9.049 + 2.890\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 9.049 |
| n | 2.890 |
| gf | 0.999 |
| gb | -0.707 |
| k | 1.000 |
| δ90 | 9.999 |
| 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 |
|---|---|---|---|
| 2022-09-23 | 2024-02-17 | +0.7893 | -0.107 |
| 2024-04-10 | 2025-08-18 | -1.8556 | +0.902 |
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 | 16:53:49.10 | -12:35:41.2 | HIP 82842 | 28.70 |
| 2026-09-20 12:00 | 16:53:49.40 | -12:37:16.6 | HIP 82842 | 28.78 |
| 2026-09-21 00:00 | 16:53:49.81 | -12:38:51.8 | HIP 82842 | 28.91 |
| 2026-09-21 12:00 | 16:53:50.35 | -12:40:27.0 | HIP 82842 | 29.11 |
| 2026-09-22 00:00 | 16:53:50.99 | -12:42:02.0 | HIP 82728 | 27.80 |
| 2026-09-22 12:00 | 16:53:51.76 | -12:43:36.8 | HIP 82728 | 26.26 |
| 2026-09-23 00:00 | 16:53:52.64 | -12:45:11.5 | HIP 82728 | 24.73 |
| 2026-09-23 12:00 | 16:53:53.64 | -12:46:46.1 | HIP 82728 | 23.19 |
| 2026-09-24 00:00 | 16:53:54.75 | -12:48:20.5 | HIP 82728 | 21.65 |
| 2026-09-24 12:00 | 16:53:55.97 | -12:49:54.8 | HIP 82728 | 20.11 |
| 2026-09-25 00:00 | 16:53:57.31 | -12:51:29.0 | HIP 82728 | 18.57 |
| 2026-09-25 12:00 | 16:53:58.76 | -12:53:03.0 | HIP 82728 | 17.03 |
| 2026-09-26 00:00 | 16:54:00.32 | -12:54:36.8 | HIP 82728 | 15.49 |
| 2026-09-26 12:00 | 16:54:01.99 | -12:56:10.5 | HIP 82728 | 13.96 |
| 2026-09-27 00:00 | 16:54:03.77 | -12:57:44.1 | HIP 82728 | 12.43 |
| 2026-09-27 12:00 | 16:54:05.67 | -12:59:17.5 | HIP 82728 | 10.91 |
| 2026-09-28 00:00 | 16:54:07.67 | -13:00:50.8 | HIP 82728 | 9.41 |
| 2026-09-28 12:00 | 16:54:09.78 | -13:02:23.8 | HIP 82728 | 7.94 |
| 2026-09-29 00:00 | 16:54:11.99 | -13:03:56.8 | HIP 82728 | 6.53 |
| 2026-09-29 12:00 | 16:54:14.32 | -13:05:29.6 | HIP 82728 | 5.24 |
| 2026-09-30 00:00 | 16:54:16.75 | -13:07:02.2 | HIP 82728 | 4.17 |
| 2026-09-30 12:00 | 16:54:19.28 | -13:08:34.7 | HIP 82728 | 3.56 |
| 2026-10-01 00:00 | 16:54:21.92 | -13:10:07.0 | HIP 82728 | 3.65 |
| 2026-10-01 12:00 | 16:54:24.67 | -13:11:39.1 | HIP 82728 | 4.40 |
| 2026-10-02 00:00 | 16:54:27.52 | -13:13:11.1 | HIP 82728 | 5.56 |
| 2026-10-02 12:00 | 16:54:30.47 | -13:14:42.9 | HIP 82728 | 6.94 |
| 2026-10-03 00:00 | 16:54:33.53 | -13:16:14.5 | HIP 82728 | 8.42 |
| 2026-10-03 12:00 | 16:54:36.68 | -13:17:46.0 | HIP 82728 | 9.98 |
| 2026-10-04 00:00 | 16:54:39.94 | -13:19:17.3 | HIP 82728 | 11.57 |
| 2026-10-04 12:00 | 16:54:43.30 | -13:20:48.4 | HIP 82728 | 13.20 |
| 2026-10-05 00:00 | 16:54:46.76 | -13:22:19.4 | HIP 82728 | 14.85 |
| 2026-10-05 12:00 | 16:54:50.32 | -13:23:50.2 | HIP 82728 | 16.53 |
| 2026-10-06 00:00 | 16:54:53.98 | -13:25:20.8 | HIP 82728 | 18.22 |
| 2026-10-06 12:00 | 16:54:57.74 | -13:26:51.2 | HIP 82728 | 19.92 |
| 2026-10-07 00:00 | 16:55:01.59 | -13:28:21.4 | HIP 82728 | 21.64 |
| 2026-10-07 12:00 | 16:55:05.54 | -13:29:51.5 | HIP 82728 | 23.37 |
| 2026-10-08 00:00 | 16:55:09.59 | -13:31:21.4 | HIP 82728 | 25.11 |
| 2026-10-08 12:00 | 16:55:13.73 | -13:32:51.1 | HIP 82728 | 26.87 |
| 2026-10-09 00:00 | 16:55:17.97 | -13:34:20.6 | HIP 82728 | 28.64 |
| 2026-10-09 12:00 | 16:55:22.30 | -13:35:49.9 | HIP 82728 | 30.42 |
| 2026-10-10 00:00 | 16:55:26.72 | -13:37:19.1 | HIP 82728 | 32.21 |
| 2026-10-10 12:00 | 16:55:31.24 | -13:38:48.0 | HIP 82728 | 34.01 |
| 2026-10-11 00:00 | 16:55:35.85 | -13:40:16.7 | HIP 82942 | 34.72 |