C/2023 U1 (Fuls)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2023 U1 (Fuls) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-10-12T19:51:42.851520Z |
| Orbit solution date (soln_date, UTC) | 2026-01-07T15:42:42Z |
| Obs used | 641 |
| NEO | - |
| M1 | 9.900 |
| K1 | 6.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2023-10-16T11:27:03.686400Z |
| Discovery magnitude (MPC) | 19.34 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) | 2025-02-02.0000000 |
| e | 0.99787289 |
| q (au) | 4.972919 |
| a (au) | 2337.878590 |
| i (deg) | 108.145664 |
| Ω (om, deg) | 305.805991 |
| ω (w, deg) | 255.633994 |
| M (ma, deg) | 0.000978 |
等級
散乱 + 全体線形
$$ M_a = (10.038 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 10.038 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.500 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2023-01-14 | 2024-10-05 | +10.8460 | -6.986 |
| 2024-10-21 | 2025-12-30 | -4.0607 | +2.693 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 22:03:48.58 | -52:59:01.5 | HIP 108852 | 8.65 |
| 2026-09-20 12:00 | 22:03:15.88 | -52:57:06.0 | HIP 108852 | 7.90 |
| 2026-09-21 00:00 | 22:02:43.42 | -52:55:08.6 | HIP 108852 | 10.30 |
| 2026-09-21 12:00 | 22:02:11.19 | -52:53:09.3 | HIP 108729 | 6.97 |
| 2026-09-22 00:00 | 22:01:39.20 | -52:51:08.2 | HIP 108729 | 5.53 |
| 2026-09-22 12:00 | 22:01:07.45 | -52:49:05.3 | HIP 108729 | 8.22 |
| 2026-09-23 00:00 | 22:00:35.94 | -52:47:00.5 | HIP 108729 | 12.60 |
| 2026-09-23 12:00 | 22:00:04.68 | -52:44:53.9 | HIP 108729 | 17.43 |
| 2026-09-24 00:00 | 21:59:33.66 | -52:42:45.6 | HIP 108729 | 22.40 |
| 2026-09-24 12:00 | 21:59:02.89 | -52:40:35.5 | HIP 108611 | 24.49 |
| 2026-09-25 00:00 | 21:58:32.38 | -52:38:23.7 | HIP 108611 | 24.88 |
| 2026-09-25 12:00 | 21:58:02.11 | -52:36:10.2 | HIP 108268 | 19.89 |
| 2026-09-26 00:00 | 21:57:32.10 | -52:33:54.9 | HIP 108268 | 14.80 |
| 2026-09-26 12:00 | 21:57:02.35 | -52:31:38.1 | HIP 108268 | 9.75 |
| 2026-09-27 00:00 | 21:56:32.85 | -52:29:19.5 | HIP 108268 | 4.73 |
| 2026-09-27 12:00 | 21:56:03.61 | -52:26:59.3 | HIP 108268 | 0.83 |
| 2026-09-28 00:00 | 21:55:34.64 | -52:24:37.6 | HIP 108268 | 5.43 |
| 2026-09-28 12:00 | 21:55:05.92 | -52:22:14.2 | HIP 108268 | 10.39 |
| 2026-09-29 00:00 | 21:54:37.46 | -52:19:49.3 | HIP 108268 | 15.36 |
| 2026-09-29 12:00 | 21:54:09.27 | -52:17:22.8 | HIP 108268 | 20.31 |
| 2026-09-30 00:00 | 21:53:41.35 | -52:14:54.8 | HIP 107865 | 22.85 |
| 2026-09-30 12:00 | 21:53:13.69 | -52:12:25.3 | HIP 107865 | 18.89 |
| 2026-10-01 00:00 | 21:52:46.30 | -52:09:54.3 | HIP 107865 | 15.53 |
| 2026-10-01 12:00 | 21:52:19.18 | -52:07:21.8 | HIP 107865 | 13.20 |
| 2026-10-02 00:00 | 21:51:52.33 | -52:04:47.9 | HIP 107865 | 12.47 |
| 2026-10-02 12:00 | 21:51:25.75 | -52:02:12.6 | HIP 107865 | 13.59 |
| 2026-10-03 00:00 | 21:50:59.44 | -51:59:35.9 | HIP 107865 | 16.16 |
| 2026-10-03 12:00 | 21:50:33.40 | -51:56:57.8 | HIP 107865 | 19.60 |
| 2026-10-04 00:00 | 21:50:07.64 | -51:54:18.3 | HIP 107865 | 23.52 |
| 2026-10-04 12:00 | 21:49:42.15 | -51:51:37.5 | HIP 107865 | 27.71 |
| 2026-10-05 00:00 | 21:49:16.94 | -51:48:55.3 | HIP 107697 | 27.12 |
| 2026-10-05 12:00 | 21:48:52.01 | -51:46:11.9 | HIP 107697 | 24.25 |
| 2026-10-06 00:00 | 21:48:27.35 | -51:43:27.1 | HIP 107697 | 22.02 |
| 2026-10-06 12:00 | 21:48:02.97 | -51:40:41.1 | HIP 107697 | 20.60 |
| 2026-10-07 00:00 | 21:47:38.87 | -51:37:53.9 | HIP 107697 | 20.16 |
| 2026-10-07 12:00 | 21:47:15.04 | -51:35:05.4 | HIP 107697 | 20.74 |
| 2026-10-08 00:00 | 21:46:51.50 | -51:32:15.8 | HIP 107576 | 20.59 |
| 2026-10-08 12:00 | 21:46:28.24 | -51:29:24.9 | HIP 107576 | 18.85 |
| 2026-10-09 00:00 | 21:46:05.25 | -51:26:32.9 | HIP 107576 | 18.12 |
| 2026-10-09 12:00 | 21:45:42.55 | -51:23:39.8 | HIP 107576 | 18.49 |
| 2026-10-10 00:00 | 21:45:20.13 | -51:20:45.6 | HIP 107576 | 19.89 |
| 2026-10-10 12:00 | 21:44:57.99 | -51:17:50.2 | HIP 107576 | 22.11 |
| 2026-10-11 00:00 | 21:44:36.13 | -51:14:53.8 | HIP 107206 | 18.73 |