C/2024 B1 (Lemmon)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 B1 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-10-07T16:58:54.436800Z |
| Orbit solution date (soln_date, UTC) | 2025-09-09T12:42:32Z |
| Obs used | 763 |
| NEO | - |
| M1 | 12.600 |
| K1 | 6.500 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-01-16T04:11:52.224000Z |
| Discovery magnitude (MPC) | 20.65 G |
| Discovery observatory (MPC) | G96 · University of Arizona Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-02-28.0000000 |
| e | 1.00088003 |
| q (au) | 1.633728 |
| a (au) | -1856.447475 |
| i (deg) | 70.903802 |
| Ω (om, deg) | 79.187466 |
| ω (w, deg) | 66.211826 |
| M (ma, deg) | 0.001766 |
等級
散乱 + 全体線形
$$ M_a = (12.317 + 3.691\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.317 |
| n | 3.691 |
| gf | 1.000 |
| gb | -0.572 |
| k | 0.800 |
| δ90 | 10.000 |
| 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 |
|---|---|---|---|
| 2023-10-13 | 2024-10-05 | +5.5116 | -1.105 |
| 2024-10-09 | 2025-01-21 | +0.2899 | -0.213 |
| 2025-01-21 | 2025-06-03 | +1.7670 | -0.947 |
| 2025-06-03 | 2025-08-19 | -1.4005 | +0.591 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 16:53:14.42 | -31:42:08.3 | HIP 82596 | 10.80 |
| 2026-07-29 12:00 | 16:53:03.43 | -31:42:24.4 | HIP 82596 | 10.43 |
| 2026-07-30 00:00 | 16:52:52.62 | -31:42:40.4 | HIP 82546 | 9.51 |
| 2026-07-30 12:00 | 16:52:41.98 | -31:42:56.2 | HIP 82546 | 7.81 |
| 2026-07-31 00:00 | 16:52:31.52 | -31:43:11.9 | HIP 82546 | 6.49 |
| 2026-07-31 12:00 | 16:52:21.23 | -31:43:27.5 | HIP 82546 | 5.78 |
| 2026-08-01 00:00 | 16:52:11.12 | -31:43:43.0 | HIP 82546 | 5.85 |
| 2026-08-01 12:00 | 16:52:01.18 | -31:43:58.3 | HIP 82546 | 6.64 |
| 2026-08-02 00:00 | 16:51:51.42 | -31:44:13.6 | HIP 82546 | 7.91 |
| 2026-08-02 12:00 | 16:51:41.84 | -31:44:28.8 | HIP 82546 | 9.45 |
| 2026-08-03 00:00 | 16:51:32.43 | -31:44:43.9 | HIP 82546 | 11.11 |
| 2026-08-03 12:00 | 16:51:23.20 | -31:44:58.9 | HIP 82423 | 11.47 |
| 2026-08-04 00:00 | 16:51:14.15 | -31:45:13.9 | HIP 82423 | 10.15 |
| 2026-08-04 12:00 | 16:51:05.27 | -31:45:28.8 | HIP 82423 | 9.09 |
| 2026-08-05 00:00 | 16:50:56.57 | -31:45:43.6 | HIP 82423 | 8.34 |
| 2026-08-05 12:00 | 16:50:48.05 | -31:45:58.3 | HIP 82423 | 7.98 |
| 2026-08-06 00:00 | 16:50:39.70 | -31:46:13.1 | HIP 82423 | 8.03 |
| 2026-08-06 12:00 | 16:50:31.54 | -31:46:27.7 | HIP 82423 | 8.46 |
| 2026-08-07 00:00 | 16:50:23.55 | -31:46:42.3 | HIP 82423 | 9.20 |
| 2026-08-07 12:00 | 16:50:15.73 | -31:46:56.9 | HIP 82423 | 10.15 |
| 2026-08-08 00:00 | 16:50:08.10 | -31:47:11.5 | HIP 82347 | 10.99 |
| 2026-08-08 12:00 | 16:50:00.64 | -31:47:26.1 | HIP 82347 | 10.18 |
| 2026-08-09 00:00 | 16:49:53.37 | -31:47:40.6 | HIP 82347 | 9.60 |
| 2026-08-09 12:00 | 16:49:46.27 | -31:47:55.1 | HIP 82347 | 9.26 |
| 2026-08-10 00:00 | 16:49:39.35 | -31:48:09.6 | HIP 82347 | 9.17 |
| 2026-08-10 12:00 | 16:49:32.61 | -31:48:24.1 | HIP 82347 | 9.32 |
| 2026-08-11 00:00 | 16:49:26.04 | -31:48:38.7 | HIP 82287 | 9.58 |
| 2026-08-11 12:00 | 16:49:19.66 | -31:48:53.2 | HIP 82287 | 8.38 |
| 2026-08-12 00:00 | 16:49:13.45 | -31:49:07.7 | HIP 82287 | 7.26 |
| 2026-08-12 12:00 | 16:49:07.42 | -31:49:22.3 | HIP 82287 | 6.25 |
| 2026-08-13 00:00 | 16:49:01.57 | -31:49:36.9 | HIP 82287 | 5.39 |
| 2026-08-13 12:00 | 16:48:55.90 | -31:49:51.5 | HIP 82287 | 4.73 |
| 2026-08-14 00:00 | 16:48:50.40 | -31:50:06.2 | HIP 82287 | 4.32 |
| 2026-08-14 12:00 | 16:48:45.08 | -31:50:20.9 | HIP 82287 | 4.20 |
| 2026-08-15 00:00 | 16:48:39.94 | -31:50:35.7 | HIP 82287 | 4.38 |
| 2026-08-15 12:00 | 16:48:34.98 | -31:50:50.5 | HIP 82250 | 3.84 |
| 2026-08-16 00:00 | 16:48:30.19 | -31:51:05.3 | HIP 82250 | 2.82 |
| 2026-08-16 12:00 | 16:48:25.58 | -31:51:20.2 | HIP 82250 | 1.87 |
| 2026-08-17 00:00 | 16:48:21.15 | -31:51:35.2 | HIP 82250 | 1.06 |
| 2026-08-17 12:00 | 16:48:16.89 | -31:51:50.3 | HIP 82250 | 0.82 |
| 2026-08-18 00:00 | 16:48:12.80 | -31:52:05.4 | HIP 82250 | 1.38 |
| 2026-08-18 12:00 | 16:48:08.90 | -31:52:20.6 | HIP 82250 | 2.16 |
| 2026-08-19 00:00 | 16:48:05.16 | -31:52:35.8 | HIP 82250 | 2.96 |