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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 22:18:06.92 | -16:24:45.6 | HIP 110176 | 12.95 |
| 2026-09-20 12:00 | 22:17:43.60 | -16:26:02.2 | HIP 110004 | 13.05 |
| 2026-09-21 00:00 | 22:17:20.43 | -16:27:17.5 | HIP 110004 | 8.30 |
| 2026-09-21 12:00 | 22:16:57.40 | -16:28:31.3 | HIP 110004 | 5.69 |
| 2026-09-22 00:00 | 22:16:34.53 | -16:29:43.7 | HIP 110004 | 7.70 |
| 2026-09-22 12:00 | 22:16:11.80 | -16:30:54.6 | HIP 110004 | 12.18 |
| 2026-09-23 00:00 | 22:15:49.24 | -16:32:04.1 | HIP 110004 | 17.26 |
| 2026-09-23 12:00 | 22:15:26.84 | -16:33:12.2 | HIP 110004 | 22.50 |
| 2026-09-24 00:00 | 22:15:04.60 | -16:34:18.7 | HIP 110004 | 27.80 |
| 2026-09-24 12:00 | 22:14:42.54 | -16:35:23.8 | HIP 109685 | 23.03 |
| 2026-09-25 00:00 | 22:14:20.64 | -16:36:27.4 | HIP 109685 | 17.72 |
| 2026-09-25 12:00 | 22:13:58.93 | -16:37:29.5 | HIP 109685 | 12.50 |
| 2026-09-26 00:00 | 22:13:37.39 | -16:38:30.2 | HIP 109685 | 7.43 |
| 2026-09-26 12:00 | 22:13:16.04 | -16:39:29.2 | HIP 109685 | 3.11 |
| 2026-09-27 00:00 | 22:12:54.87 | -16:40:26.8 | HIP 109685 | 4.24 |
| 2026-09-27 12:00 | 22:12:33.90 | -16:41:22.9 | HIP 109685 | 8.86 |
| 2026-09-28 00:00 | 22:12:13.11 | -16:42:17.4 | HIP 109685 | 13.78 |
| 2026-09-28 12:00 | 22:11:52.53 | -16:43:10.4 | HIP 109685 | 18.72 |
| 2026-09-29 00:00 | 22:11:32.14 | -16:44:01.8 | HIP 109685 | 23.64 |
| 2026-09-29 12:00 | 22:11:11.96 | -16:44:51.6 | HIP 109685 | 28.51 |
| 2026-09-30 00:00 | 22:10:51.98 | -16:45:40.0 | HIP 109500 | 33.11 |
| 2026-09-30 12:00 | 22:10:32.22 | -16:46:26.7 | HIP 109297 | 30.46 |
| 2026-10-01 00:00 | 22:10:12.66 | -16:47:11.9 | HIP 109297 | 26.36 |
| 2026-10-01 12:00 | 22:09:53.32 | -16:47:55.4 | HIP 109297 | 22.54 |
| 2026-10-02 00:00 | 22:09:34.20 | -16:48:37.4 | HIP 109297 | 19.13 |
| 2026-10-02 12:00 | 22:09:15.31 | -16:49:17.9 | HIP 109297 | 16.36 |
| 2026-10-03 00:00 | 22:08:56.63 | -16:49:56.7 | HIP 109297 | 14.52 |
| 2026-10-03 12:00 | 22:08:38.19 | -16:50:33.9 | HIP 109297 | 13.94 |
| 2026-10-04 00:00 | 22:08:19.97 | -16:51:09.5 | HIP 109297 | 14.72 |
| 2026-10-04 12:00 | 22:08:01.99 | -16:51:43.5 | HIP 109297 | 16.61 |
| 2026-10-05 00:00 | 22:07:44.25 | -16:52:15.9 | HIP 109297 | 19.26 |
| 2026-10-05 12:00 | 22:07:26.74 | -16:52:46.6 | HIP 109297 | 22.36 |
| 2026-10-06 00:00 | 22:07:09.48 | -16:53:15.7 | HIP 109297 | 25.71 |
| 2026-10-06 12:00 | 22:06:52.46 | -16:53:43.2 | HIP 109062 | 27.14 |
| 2026-10-07 00:00 | 22:06:35.69 | -16:54:09.1 | HIP 109062 | 25.04 |
| 2026-10-07 12:00 | 22:06:19.17 | -16:54:33.3 | HIP 109062 | 23.45 |
| 2026-10-08 00:00 | 22:06:02.90 | -16:54:55.9 | HIP 109062 | 22.45 |
| 2026-10-08 12:00 | 22:05:46.89 | -16:55:16.9 | HIP 109062 | 22.09 |
| 2026-10-09 00:00 | 22:05:31.13 | -16:55:36.2 | HIP 109062 | 22.36 |
| 2026-10-09 12:00 | 22:05:15.63 | -16:55:53.8 | HIP 109062 | 23.22 |
| 2026-10-10 00:00 | 22:05:00.40 | -16:56:09.8 | HIP 109062 | 24.56 |
| 2026-10-10 12:00 | 22:04:45.43 | -16:56:24.2 | HIP 109062 | 26.29 |
| 2026-10-11 00:00 | 22:04:30.72 | -16:56:36.9 | HIP 108876 | 25.51 |