C/2023 A3 (Tsuchinshan-ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2023 A3 (Tsuchinshan-ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-09-27T17:46:48.645120Z |
| Orbit solution date (soln_date, UTC) | 2026-05-28T12:12:16Z |
| Obs used | 7261 |
| NEO | - |
| M1 | 8.900 |
| K1 | 5.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2023-01-09T21:31:51.081600Z |
| Discovery magnitude (MPC) | 18.70 R |
| Discovery observatory (MPC) | D29 · Purple Mountain Observatory, XuYi Station |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-05-18.0000000 |
| e | 1.00009531 |
| q (au) | 0.391430 |
| a (au) | -4106.948099 |
| i (deg) | 139.112110 |
| Ω (om, deg) | 21.559479 |
| ω (w, deg) | 308.491771 |
| M (ma, deg) | -0.000497 |
等級
散乱 + 全体線形
$$ M_a = (8.261 + 4.231\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.261 |
| n | 4.231 |
| gf | 1.000 |
| gb | -0.828 |
| k | 0.894 |
| 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 |
|---|---|---|---|
| 2022-04-09 | 2024-02-07 | +5.2170 | -4.501 |
| 2024-02-07 | 2024-04-30 | -14.1728 | +6.848 |
| 2024-04-30 | 2024-09-27 | +1.3482 | -0.613 |
| 2024-09-27 | 2024-10-09 | -8.4224 | -3.442 |
| 2024-10-09 | 2024-10-26 | +11.0219 | +1.935 |
| 2024-10-26 | 2024-11-20 | -8.9322 | -0.071 |
| 2024-11-20 | 2025-11-20 | +4.7660 | -1.720 |
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 | 18:32:49.10 | +21:25:05.5 | HIP 90961 | 27.33 |
| 2026-06-01 12:00 | 18:32:30.34 | +21:26:02.0 | HIP 90751 | 25.04 |
| 2026-06-02 00:00 | 18:32:11.52 | +21:26:57.0 | HIP 90751 | 20.90 |
| 2026-06-02 12:00 | 18:31:52.63 | +21:27:50.5 | HIP 90751 | 16.93 |
| 2026-06-03 00:00 | 18:31:33.68 | +21:28:42.4 | HIP 90751 | 13.30 |
| 2026-06-03 12:00 | 18:31:14.67 | +21:29:32.8 | HIP 90751 | 10.40 |
| 2026-06-04 00:00 | 18:30:55.60 | +21:30:21.7 | HIP 90751 | 8.96 |
| 2026-06-04 12:00 | 18:30:36.47 | +21:31:08.9 | HIP 90667 | 8.78 |
| 2026-06-05 00:00 | 18:30:17.28 | +21:31:54.7 | HIP 90667 | 4.35 |
| 2026-06-05 12:00 | 18:29:58.04 | +21:32:38.8 | HIP 90667 | 1.27 |
| 2026-06-06 00:00 | 18:29:38.74 | +21:33:21.4 | HIP 90667 | 5.05 |
| 2026-06-06 12:00 | 18:29:19.39 | +21:34:02.3 | HIP 90667 | 9.52 |
| 2026-06-07 00:00 | 18:29:00.00 | +21:34:41.7 | HIP 90667 | 14.05 |
| 2026-06-07 12:00 | 18:28:40.55 | +21:35:19.5 | HIP 90667 | 18.60 |
| 2026-06-08 00:00 | 18:28:21.06 | +21:35:55.7 | HIP 90667 | 23.16 |
| 2026-06-08 12:00 | 18:28:01.53 | +21:36:30.3 | HIP 90667 | 27.73 |
| 2026-06-09 00:00 | 18:27:41.95 | +21:37:03.3 | HIP 90338 | 24.47 |
| 2026-06-09 12:00 | 18:27:22.33 | +21:37:34.7 | HIP 90338 | 19.94 |
| 2026-06-10 00:00 | 18:27:02.67 | +21:38:04.4 | HIP 90338 | 15.43 |
| 2026-06-10 12:00 | 18:26:42.98 | +21:38:32.5 | HIP 90338 | 10.97 |
| 2026-06-11 00:00 | 18:26:23.25 | +21:38:59.0 | HIP 90338 | 6.71 |
| 2026-06-11 12:00 | 18:26:03.49 | +21:39:23.9 | HIP 90338 | 3.43 |
| 2026-06-12 00:00 | 18:25:43.70 | +21:39:47.1 | HIP 90338 | 4.57 |
| 2026-06-12 12:00 | 18:25:23.87 | +21:40:08.7 | HIP 90338 | 8.52 |
| 2026-06-13 00:00 | 18:25:04.02 | +21:40:28.7 | HIP 90338 | 12.92 |
| 2026-06-13 12:00 | 18:24:44.15 | +21:40:47.0 | HIP 90139 | 15.47 |
| 2026-06-14 00:00 | 18:24:24.25 | +21:41:03.6 | HIP 90139 | 11.13 |
| 2026-06-14 12:00 | 18:24:04.33 | +21:41:18.6 | HIP 90139 | 7.18 |
| 2026-06-15 00:00 | 18:23:44.39 | +21:41:32.0 | HIP 90139 | 4.73 |
| 2026-06-15 12:00 | 18:23:24.44 | +21:41:43.7 | HIP 90139 | 6.03 |
| 2026-06-16 00:00 | 18:23:04.47 | +21:41:53.7 | HIP 90139 | 9.68 |
| 2026-06-16 12:00 | 18:22:44.49 | +21:42:02.1 | HIP 90139 | 13.94 |
| 2026-06-17 00:00 | 18:22:24.49 | +21:42:08.9 | HIP 89999 | 14.37 |
| 2026-06-17 12:00 | 18:22:04.49 | +21:42:14.0 | HIP 89999 | 12.34 |
| 2026-06-18 00:00 | 18:21:44.48 | +21:42:17.4 | HIP 89999 | 11.86 |
| 2026-06-18 12:00 | 18:21:24.47 | +21:42:19.2 | HIP 89999 | 13.10 |
| 2026-06-19 00:00 | 18:21:04.45 | +21:42:19.3 | HIP 89999 | 15.66 |
| 2026-06-19 12:00 | 18:20:44.43 | +21:42:17.8 | HIP 89861 | 16.58 |
| 2026-06-20 00:00 | 18:20:24.42 | +21:42:14.6 | HIP 89861 | 15.52 |
| 2026-06-20 12:00 | 18:20:04.41 | +21:42:09.8 | HIP 89861 | 15.84 |
| 2026-06-21 00:00 | 18:19:44.40 | +21:42:03.3 | HIP 89861 | 17.46 |
| 2026-06-21 12:00 | 18:19:24.40 | +21:41:55.2 | HIP 89861 | 20.07 |
| 2026-06-22 00:00 | 18:19:04.41 | +21:41:45.5 | HIP 89861 | 23.34 |