405P/Lemmon
メタデータ
| 項目 | 値 |
|---|---|
| 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 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| 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 |
等級
散乱 + 全体線形
$$ M_a = (19.090 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 19.090 |
| n | 2.000 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.800 |
| δ90 | 2.314 |
| パラメータ | 記号 | 範囲 | 説明 |
|---|---|---|---|
| 太陽・地球距離が1 AUのときの絶対等級 | H0 | -5 to 20 | 彗星の固有の明るさ |
| 測光スロープパラメータ | n | 2 to 6 | 太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 | gf |
0.8 to 1 | 前方散乱の強さ |
| 後方散乱非対称係数 | gb |
-1 to -0.5 | 後方散乱の強さ |
| 分配係数 | k | 0.8 to 1 | 前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 | δ90 | 1 to 10 | ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (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(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 23:00:43.62 | -12:15:22.8 | HIP 113771 | 25.98 |
| 2026-06-01 12:00 | 23:00:53.87 | -12:14:40.1 | HIP 113771 | 23.87 |
| 2026-06-02 00:00 | 23:01:03.96 | -12:13:58.5 | HIP 113771 | 21.89 |
| 2026-06-02 12:00 | 23:01:13.88 | -12:13:18.0 | HIP 113771 | 20.08 |
| 2026-06-03 00:00 | 23:01:23.64 | -12:12:38.6 | HIP 113771 | 18.45 |
| 2026-06-03 12:00 | 23:01:33.23 | -12:12:00.2 | HIP 113771 | 17.04 |
| 2026-06-04 00:00 | 23:01:42.66 | -12:11:23.0 | HIP 113771 | 15.89 |
| 2026-06-04 12:00 | 23:01:51.91 | -12:10:46.8 | HIP 113771 | 15.04 |
| 2026-06-05 00:00 | 23:02:01.00 | -12:10:11.8 | HIP 113771 | 14.53 |
| 2026-06-05 12:00 | 23:02:09.92 | -12:09:37.8 | HIP 113771 | 14.35 |
| 2026-06-06 00:00 | 23:02:18.66 | -12:09:05.0 | HIP 113771 | 14.52 |
| 2026-06-06 12:00 | 23:02:27.23 | -12:08:33.3 | HIP 113771 | 14.99 |
| 2026-06-07 00:00 | 23:02:35.63 | -12:08:02.8 | HIP 113771 | 15.72 |
| 2026-06-07 12:00 | 23:02:43.85 | -12:07:33.4 | HIP 113771 | 16.65 |
| 2026-06-08 00:00 | 23:02:51.89 | -12:07:05.1 | HIP 113771 | 17.74 |
| 2026-06-08 12:00 | 23:02:59.76 | -12:06:38.0 | HIP 113771 | 18.95 |
| 2026-06-09 00:00 | 23:03:07.45 | -12:06:12.1 | HIP 113771 | 20.24 |
| 2026-06-09 12:00 | 23:03:14.95 | -12:05:47.3 | HIP 113945 | 19.05 |
| 2026-06-10 00:00 | 23:03:22.27 | -12:05:23.7 | HIP 113945 | 17.45 |
| 2026-06-10 12:00 | 23:03:29.41 | -12:05:01.3 | HIP 113945 | 15.93 |
| 2026-06-11 00:00 | 23:03:36.37 | -12:04:40.1 | HIP 113945 | 14.50 |
| 2026-06-11 12:00 | 23:03:43.14 | -12:04:20.0 | HIP 113945 | 13.17 |
| 2026-06-12 00:00 | 23:03:49.72 | -12:04:01.2 | HIP 113945 | 11.97 |
| 2026-06-12 12:00 | 23:03:56.12 | -12:03:43.5 | HIP 113945 | 10.90 |
| 2026-06-13 00:00 | 23:04:02.32 | -12:03:27.1 | HIP 113945 | 9.99 |
| 2026-06-13 12:00 | 23:04:08.33 | -12:03:11.9 | HIP 113945 | 9.25 |
| 2026-06-14 00:00 | 23:04:14.16 | -12:02:58.0 | HIP 113945 | 8.72 |
| 2026-06-14 12:00 | 23:04:19.78 | -12:02:45.2 | HIP 113945 | 8.40 |
| 2026-06-15 00:00 | 23:04:25.22 | -12:02:33.7 | HIP 113945 | 8.28 |
| 2026-06-15 12:00 | 23:04:30.45 | -12:02:23.4 | HIP 113945 | 8.36 |
| 2026-06-16 00:00 | 23:04:35.50 | -12:02:14.4 | HIP 113945 | 8.61 |
| 2026-06-16 12:00 | 23:04:40.34 | -12:02:06.6 | HIP 113945 | 8.99 |
| 2026-06-17 00:00 | 23:04:44.98 | -12:02:00.1 | HIP 113945 | 9.47 |
| 2026-06-17 12:00 | 23:04:49.43 | -12:01:54.8 | HIP 113945 | 10.01 |
| 2026-06-18 00:00 | 23:04:53.67 | -12:01:50.7 | HIP 113945 | 10.59 |
| 2026-06-18 12:00 | 23:04:57.71 | -12:01:48.0 | HIP 113945 | 11.20 |
| 2026-06-19 00:00 | 23:05:01.55 | -12:01:46.5 | HIP 113945 | 11.80 |
| 2026-06-19 12:00 | 23:05:05.19 | -12:01:46.2 | HIP 113945 | 12.40 |
| 2026-06-20 00:00 | 23:05:08.62 | -12:01:47.3 | HIP 113945 | 12.98 |
| 2026-06-20 12:00 | 23:05:11.84 | -12:01:49.6 | HIP 113945 | 13.54 |
| 2026-06-21 00:00 | 23:05:14.86 | -12:01:53.1 | HIP 113945 | 14.06 |
| 2026-06-21 12:00 | 23:05:17.67 | -12:01:58.0 | HIP 113945 | 14.55 |
| 2026-06-22 00:00 | 23:05:20.27 | -12:02:04.1 | HIP 113945 | 15.01 |