C/2022 S4 (Lemmon)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 S4 (Lemmon) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-07-18T11:28:03.768960Z |
| Orbit solution date (soln_date, UTC) | 2025-06-26T10:12:44Z |
| Obs used | 755 |
| NEO | - |
| M1 | 11.100 |
| K1 | 6.250 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2022-09-19T11:42:45.187200Z |
| Discovery magnitude (MPC) | 20.67 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-09-26.0000000 |
| e | 0.99886708 |
| q (au) | 2.763069 |
| a (au) | 2438.893835 |
| i (deg) | 101.220290 |
| Ω (om, deg) | 220.174408 |
| ω (w, deg) | 268.485380 |
| M (ma, deg) | 359.997574 |
等級
散乱 + 全体線形
$$ M_a = (11.854 + 3.414\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.854 |
| n | 3.414 |
| gf | 0.998 |
| gb | -0.683 |
| 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 |
|---|---|---|---|
| 2022-08-26 | 2023-02-15 | +16.0365 | -12.988 |
| 2023-02-15 | 2024-07-18 | -5.8712 | +3.359 |
| 2024-08-08 | 2025-06-03 | +13.2985 | -4.851 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 14:57:28.48 | -09:51:12.2 | HIP 73132 | 10.79 |
| 2026-03-26 12:00 | 14:57:13.06 | -09:47:38.8 | HIP 73132 | 8.77 |
| 2026-03-27 00:00 | 14:56:57.52 | -09:44:05.0 | HIP 73132 | 9.57 |
| 2026-03-27 12:00 | 14:56:41.86 | -09:40:30.8 | HIP 73132 | 12.69 |
| 2026-03-28 00:00 | 14:56:26.08 | -09:36:56.1 | HIP 73132 | 16.92 |
| 2026-03-28 12:00 | 14:56:10.18 | -09:33:21.0 | HIP 73022 | 12.05 |
| 2026-03-29 00:00 | 14:55:54.17 | -09:29:45.5 | HIP 73022 | 7.18 |
| 2026-03-29 12:00 | 14:55:38.04 | -09:26:09.7 | HIP 73022 | 3.84 |
| 2026-03-30 00:00 | 14:55:21.80 | -09:22:33.5 | HIP 73022 | 5.97 |
| 2026-03-30 12:00 | 14:55:05.45 | -09:18:56.9 | HIP 73022 | 10.72 |
| 2026-03-31 00:00 | 14:54:48.99 | -09:15:20.0 | HIP 72998 | 10.55 |
| 2026-03-31 12:00 | 14:54:32.43 | -09:11:42.8 | HIP 72998 | 10.43 |
| 2026-04-01 00:00 | 14:54:15.76 | -09:08:05.2 | HIP 72891 | 6.69 |
| 2026-04-01 12:00 | 14:53:58.99 | -09:04:27.4 | HIP 72891 | 2.00 |
| 2026-04-02 00:00 | 14:53:42.11 | -09:00:49.3 | HIP 72891 | 4.90 |
| 2026-04-02 12:00 | 14:53:25.14 | -08:57:10.9 | HIP 72891 | 10.28 |
| 2026-04-03 00:00 | 14:53:08.07 | -08:53:32.3 | HIP 72808 | 12.32 |
| 2026-04-03 12:00 | 14:52:50.90 | -08:49:53.4 | HIP 72808 | 8.18 |
| 2026-04-04 00:00 | 14:52:33.64 | -08:46:14.3 | HIP 72808 | 6.68 |
| 2026-04-04 12:00 | 14:52:16.29 | -08:42:35.0 | HIP 72808 | 9.27 |
| 2026-04-05 00:00 | 14:51:58.84 | -08:38:55.5 | HIP 72808 | 13.83 |
| 2026-04-05 12:00 | 14:51:41.31 | -08:35:15.8 | HIP 72808 | 19.02 |
| 2026-04-06 00:00 | 14:51:23.70 | -08:31:36.0 | HIP 72606 | 20.85 |
| 2026-04-06 12:00 | 14:51:05.99 | -08:27:56.0 | HIP 72606 | 15.63 |
| 2026-04-07 00:00 | 14:50:48.21 | -08:24:15.9 | HIP 72606 | 10.91 |
| 2026-04-07 12:00 | 14:50:30.34 | -08:20:35.6 | HIP 72606 | 7.71 |
| 2026-04-08 00:00 | 14:50:12.40 | -08:16:55.3 | HIP 72606 | 8.13 |
| 2026-04-08 12:00 | 14:49:54.38 | -08:13:14.9 | HIP 72606 | 11.82 |
| 2026-04-09 00:00 | 14:49:36.29 | -08:09:34.4 | HIP 72606 | 16.76 |
| 2026-04-09 12:00 | 14:49:18.12 | -08:05:53.9 | HIP 72566 | 19.98 |
| 2026-04-10 00:00 | 14:48:59.88 | -08:02:13.3 | HIP 72566 | 21.42 |
| 2026-04-10 12:00 | 14:48:41.58 | -07:58:32.7 | HIP 72566 | 24.23 |
| 2026-04-11 00:00 | 14:48:23.21 | -07:54:52.1 | HIP 72566 | 28.01 |
| 2026-04-11 12:00 | 14:48:04.77 | -07:51:11.5 | HIP 72218 | 27.76 |
| 2026-04-12 00:00 | 14:47:46.27 | -07:47:31.0 | HIP 72218 | 22.98 |
| 2026-04-12 12:00 | 14:47:27.72 | -07:43:50.5 | HIP 72218 | 18.81 |
| 2026-04-13 00:00 | 14:47:09.10 | -07:40:10.1 | HIP 72218 | 15.75 |
| 2026-04-13 12:00 | 14:46:50.43 | -07:36:29.7 | HIP 72218 | 14.55 |
| 2026-04-14 00:00 | 14:46:31.71 | -07:32:49.5 | HIP 72218 | 15.65 |
| 2026-04-14 12:00 | 14:46:12.94 | -07:29:09.4 | HIP 72218 | 18.66 |
| 2026-04-15 00:00 | 14:45:54.12 | -07:25:29.4 | HIP 72079 | 22.83 |
| 2026-04-15 12:00 | 14:45:35.25 | -07:21:49.6 | HIP 72079 | 16.89 |
| 2026-04-16 00:00 | 14:45:16.34 | -07:18:09.9 | HIP 72079 | 10.94 |