405P/Lemmon
메타데이터
| 항목 | 값 |
|---|---|
| Designation | 405P/Lemmon |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-12-24T14:12:20.220480Z |
| Orbit solution date (soln_date, UTC) | 2021-05-31T22:43:11Z |
| Obs used | 1017 |
| NEO | Yes |
| M1 | 18.800 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2020-10-17T03:08:48.076800Z |
| Discovery magnitude (MPC) | 18.80 G |
| Discovery observatory (MPC) | Z84 · Calar Alto-Schmidt |
Osculating 궤도요소
| 항목 | 값 |
|---|---|
| Epoch (epoch_cal, TDB) | 2017-12-04.0000000 |
| e | 0.68914700 |
| q (au) | 1.121217 |
| a (au) | 3.606904 |
| i (deg) | 9.365069 |
| Ω (om, deg) | 3.311168 |
| ω (w, deg) | 112.292821 |
| M (ma, deg) | 199.344113 |
밝기
산란 + 전체 선형
$$ M_a = (19.090 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
모델 상수
| 항목 | 값 |
|---|---|
| H0 | 19.090 |
| n | 2.000 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.800 |
| δ90 | 2.314 |
| 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 |
|---|---|---|---|
| 2020-06-28 | 2020-12-24 | -1.5360 | -0.178 |
| 2020-12-24 | 2021-03-05 | +6.7770 | -0.321 |
| 2021-03-05 | 2021-05-10 | -7.1641 | +1.615 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
찾아보기
천체력
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 22:57:57.81 | -13:09:19.9 | HIP 113531 | 24.36 |
| 2026-07-29 12:00 | 22:57:42.89 | -13:10:59.2 | HIP 113409 | 28.10 |
| 2026-07-30 00:00 | 22:57:27.74 | -13:12:39.4 | HIP 113250 | 26.35 |
| 2026-07-30 12:00 | 22:57:12.36 | -13:14:20.6 | HIP 113250 | 24.47 |
| 2026-07-31 00:00 | 22:56:56.75 | -13:16:02.8 | HIP 113250 | 23.14 |
| 2026-07-31 12:00 | 22:56:40.91 | -13:17:45.8 | HIP 113250 | 22.51 |
| 2026-08-01 00:00 | 22:56:24.84 | -13:19:29.7 | HIP 113250 | 22.66 |
| 2026-08-01 12:00 | 22:56:08.55 | -13:21:14.6 | HIP 113250 | 23.60 |
| 2026-08-02 00:00 | 22:55:52.03 | -13:23:00.3 | HIP 113194 | 22.54 |
| 2026-08-02 12:00 | 22:55:35.29 | -13:24:46.8 | HIP 113194 | 19.87 |
| 2026-08-03 00:00 | 22:55:18.33 | -13:26:34.2 | HIP 113194 | 17.91 |
| 2026-08-03 12:00 | 22:55:01.14 | -13:28:22.4 | HIP 113070 | 15.16 |
| 2026-08-04 00:00 | 22:54:43.74 | -13:30:11.5 | HIP 113070 | 10.70 |
| 2026-08-04 12:00 | 22:54:26.12 | -13:32:01.3 | HIP 113070 | 6.38 |
| 2026-08-05 00:00 | 22:54:08.28 | -13:33:51.9 | HIP 113070 | 3.20 |
| 2026-08-05 12:00 | 22:53:50.22 | -13:35:43.2 | HIP 113070 | 4.95 |
| 2026-08-06 00:00 | 22:53:31.96 | -13:37:35.2 | HIP 113070 | 9.22 |
| 2026-08-06 12:00 | 22:53:13.48 | -13:39:28.0 | HIP 113070 | 13.90 |
| 2026-08-07 00:00 | 22:52:54.79 | -13:41:21.5 | HIP 113070 | 18.73 |
| 2026-08-07 12:00 | 22:52:35.89 | -13:43:15.6 | HIP 113070 | 23.64 |
| 2026-08-08 00:00 | 22:52:16.79 | -13:45:10.4 | HIP 113070 | 28.62 |
| 2026-08-08 12:00 | 22:51:57.48 | -13:47:05.9 | HIP 112782 | 28.00 |
| 2026-08-09 00:00 | 22:51:37.97 | -13:49:01.9 | HIP 112782 | 23.06 |
| 2026-08-09 12:00 | 22:51:18.26 | -13:50:58.5 | HIP 112782 | 18.18 |
| 2026-08-10 00:00 | 22:50:58.36 | -13:52:55.7 | HIP 112782 | 13.49 |
| 2026-08-10 12:00 | 22:50:38.26 | -13:54:53.5 | HIP 112782 | 9.32 |
| 2026-08-11 00:00 | 22:50:17.97 | -13:56:51.7 | HIP 112782 | 6.86 |
| 2026-08-11 12:00 | 22:49:57.48 | -13:58:50.5 | HIP 112782 | 8.01 |
| 2026-08-12 00:00 | 22:49:36.82 | -14:00:49.7 | HIP 112782 | 11.80 |
| 2026-08-12 12:00 | 22:49:15.96 | -14:02:49.3 | HIP 112782 | 16.55 |
| 2026-08-13 00:00 | 22:48:54.93 | -14:04:49.4 | HIP 112542 | 17.56 |
| 2026-08-13 12:00 | 22:48:33.72 | -14:06:49.9 | HIP 112542 | 12.83 |
| 2026-08-14 00:00 | 22:48:12.33 | -14:08:50.7 | HIP 112542 | 9.01 |
| 2026-08-14 12:00 | 22:47:50.77 | -14:10:51.9 | HIP 112542 | 7.73 |
| 2026-08-15 00:00 | 22:47:29.04 | -14:12:53.4 | HIP 112542 | 10.07 |
| 2026-08-15 12:00 | 22:47:07.15 | -14:14:55.2 | HIP 112542 | 14.41 |
| 2026-08-16 00:00 | 22:46:45.09 | -14:16:57.2 | HIP 112409 | 18.03 |
| 2026-08-16 12:00 | 22:46:22.87 | -14:18:59.5 | HIP 112409 | 13.86 |
| 2026-08-17 00:00 | 22:46:00.50 | -14:21:02.0 | HIP 112409 | 11.20 |
| 2026-08-17 12:00 | 22:45:37.98 | -14:23:04.7 | HIP 112409 | 11.24 |
| 2026-08-18 00:00 | 22:45:15.30 | -14:25:07.5 | HIP 112409 | 13.99 |
| 2026-08-18 12:00 | 22:44:52.48 | -14:27:10.5 | HIP 112260 | 12.78 |
| 2026-08-19 00:00 | 22:44:29.52 | -14:29:13.5 | HIP 112260 | 8.04 |