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) | 2024-09-27T17:46:49.025280Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:12:17Z |
| Obs used | 7329 |
| 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 | 1.00009537 |
| q (au) | 0.391430 |
| a (au) | -4104.394095 |
| i (deg) | 139.112109 |
| Ω (om, deg) | 21.559479 |
| ω (w, deg) | 308.491765 |
| M (ma, deg) | -0.000498 |
等級
散乱 + 全体線形
$$ M_a = (8.262 + 4.233\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.262 |
| n | 4.233 |
| 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 | +5.2147 | -4.500 |
| 2024-02-07 | 2024-04-30 | -14.1815 | +6.852 |
| 2024-04-30 | 2024-09-27 | +1.3465 | -0.613 |
| 2024-09-27 | 2024-10-09 | -8.4312 | -3.445 |
| 2024-10-09 | 2024-10-26 | +11.0144 | +1.934 |
| 2024-10-26 | 2024-11-20 | -8.9069 | -0.070 |
| 2024-11-20 | 2026-07-20 | +4.7398 | -1.711 |
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 | 17:56:52.69 | +20:21:19.9 | HIP 87934 | 12.54 |
| 2026-07-29 12:00 | 17:56:38.13 | +20:19:28.1 | HIP 87934 | 15.99 |
| 2026-07-30 00:00 | 17:56:23.69 | +20:17:35.4 | HIP 87934 | 19.59 |
| 2026-07-30 12:00 | 17:56:09.36 | +20:15:41.7 | HIP 87693 | 20.18 |
| 2026-07-31 00:00 | 17:55:55.17 | +20:13:47.1 | HIP 87693 | 17.03 |
| 2026-07-31 12:00 | 17:55:41.09 | +20:11:51.7 | HIP 87693 | 14.26 |
| 2026-08-01 00:00 | 17:55:27.14 | +20:09:55.3 | HIP 87693 | 12.10 |
| 2026-08-01 12:00 | 17:55:13.31 | +20:07:58.1 | HIP 87693 | 10.92 |
| 2026-08-02 00:00 | 17:54:59.61 | +20:06:00.0 | HIP 87693 | 11.01 |
| 2026-08-02 12:00 | 17:54:46.04 | +20:04:01.1 | HIP 87693 | 12.32 |
| 2026-08-03 00:00 | 17:54:32.59 | +20:02:01.4 | HIP 87693 | 14.52 |
| 2026-08-03 12:00 | 17:54:19.27 | +20:00:00.8 | HIP 87693 | 17.26 |
| 2026-08-04 00:00 | 17:54:06.08 | +19:57:59.4 | HIP 87693 | 20.32 |
| 2026-08-04 12:00 | 17:53:53.01 | +19:55:57.2 | HIP 87628 | 23.18 |
| 2026-08-05 00:00 | 17:53:40.08 | +19:53:54.3 | HIP 87499 | 20.00 |
| 2026-08-05 12:00 | 17:53:27.28 | +19:51:50.6 | HIP 87499 | 16.44 |
| 2026-08-06 00:00 | 17:53:14.61 | +19:49:46.1 | HIP 87499 | 12.93 |
| 2026-08-06 12:00 | 17:53:02.07 | +19:47:40.9 | HIP 87499 | 9.53 |
| 2026-08-07 00:00 | 17:52:49.66 | +19:45:34.9 | HIP 87499 | 6.36 |
| 2026-08-07 12:00 | 17:52:37.38 | +19:43:28.3 | HIP 87499 | 3.97 |
| 2026-08-08 00:00 | 17:52:25.24 | +19:41:20.9 | HIP 87499 | 4.05 |
| 2026-08-08 12:00 | 17:52:13.24 | +19:39:12.9 | HIP 87499 | 6.49 |
| 2026-08-09 00:00 | 17:52:01.36 | +19:37:04.1 | HIP 87499 | 9.61 |
| 2026-08-09 12:00 | 17:51:49.62 | +19:34:54.7 | HIP 87499 | 12.91 |
| 2026-08-10 00:00 | 17:51:38.02 | +19:32:44.7 | HIP 87499 | 16.28 |
| 2026-08-10 12:00 | 17:51:26.56 | +19:30:34.0 | HIP 87499 | 19.66 |
| 2026-08-11 00:00 | 17:51:15.23 | +19:28:22.8 | HIP 87499 | 23.05 |
| 2026-08-11 12:00 | 17:51:04.04 | +19:26:10.9 | HIP 87499 | 26.43 |
| 2026-08-12 00:00 | 17:50:52.98 | +19:23:58.4 | HIP 87499 | 29.80 |
| 2026-08-12 12:00 | 17:50:42.07 | +19:21:45.3 | HIP 87192 | 27.70 |
| 2026-08-13 00:00 | 17:50:31.29 | +19:19:31.7 | HIP 87192 | 24.77 |
| 2026-08-13 12:00 | 17:50:20.66 | +19:17:17.5 | HIP 87192 | 21.98 |
| 2026-08-14 00:00 | 17:50:10.16 | +19:15:02.8 | HIP 87192 | 19.42 |
| 2026-08-14 12:00 | 17:49:59.80 | +19:12:47.6 | HIP 87192 | 17.16 |
| 2026-08-15 00:00 | 17:49:49.58 | +19:10:31.9 | HIP 87192 | 15.33 |
| 2026-08-15 12:00 | 17:49:39.50 | +19:08:15.7 | HIP 87192 | 14.07 |
| 2026-08-16 00:00 | 17:49:29.57 | +19:05:59.0 | HIP 87192 | 13.55 |
| 2026-08-16 12:00 | 17:49:19.77 | +19:03:41.9 | HIP 87192 | 13.83 |
| 2026-08-17 00:00 | 17:49:10.11 | +19:01:24.3 | HIP 87192 | 14.85 |
| 2026-08-17 12:00 | 17:49:00.60 | +18:59:06.3 | HIP 87192 | 16.47 |
| 2026-08-18 00:00 | 17:48:51.22 | +18:56:47.8 | HIP 87192 | 18.52 |
| 2026-08-18 12:00 | 17:48:41.99 | +18:54:29.0 | HIP 87069 | 16.62 |
| 2026-08-19 00:00 | 17:48:32.90 | +18:52:09.8 | HIP 87069 | 14.49 |