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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:43:40.44 | +16:19:23.7 | HIP 86816 | 21.45 |
| 2026-09-20 12:00 | 17:43:40.21 | +16:17:04.4 | HIP 86816 | 19.45 |
| 2026-09-21 00:00 | 17:43:40.11 | +16:14:45.4 | HIP 86816 | 17.52 |
| 2026-09-21 12:00 | 17:43:40.13 | +16:12:26.7 | HIP 86816 | 15.67 |
| 2026-09-22 00:00 | 17:43:40.28 | +16:10:08.4 | HIP 86816 | 13.95 |
| 2026-09-22 12:00 | 17:43:40.54 | +16:07:50.5 | HIP 86816 | 12.41 |
| 2026-09-23 00:00 | 17:43:40.93 | +16:05:32.9 | HIP 86816 | 11.10 |
| 2026-09-23 12:00 | 17:43:41.44 | +16:03:15.7 | HIP 86816 | 10.12 |
| 2026-09-24 00:00 | 17:43:42.07 | +16:00:58.9 | HIP 86816 | 9.57 |
| 2026-09-24 12:00 | 17:43:42.82 | +15:58:42.4 | HIP 86816 | 9.52 |
| 2026-09-25 00:00 | 17:43:43.69 | +15:56:26.4 | HIP 86816 | 9.98 |
| 2026-09-25 12:00 | 17:43:44.68 | +15:54:10.8 | HIP 86816 | 10.87 |
| 2026-09-26 00:00 | 17:43:45.79 | +15:51:55.6 | HIP 86816 | 12.11 |
| 2026-09-26 12:00 | 17:43:47.01 | +15:49:40.8 | HIP 86816 | 13.59 |
| 2026-09-27 00:00 | 17:43:48.35 | +15:47:26.5 | HIP 86816 | 15.24 |
| 2026-09-27 12:00 | 17:43:49.81 | +15:45:12.6 | HIP 86816 | 17.01 |
| 2026-09-28 00:00 | 17:43:51.38 | +15:42:59.1 | HIP 86816 | 18.88 |
| 2026-09-28 12:00 | 17:43:53.07 | +15:40:46.1 | HIP 86816 | 20.80 |
| 2026-09-29 00:00 | 17:43:54.87 | +15:38:33.5 | HIP 86816 | 22.77 |
| 2026-09-29 12:00 | 17:43:56.79 | +15:36:21.4 | HIP 86816 | 24.77 |
| 2026-09-30 00:00 | 17:43:58.82 | +15:34:09.8 | HIP 86816 | 26.80 |
| 2026-09-30 12:00 | 17:44:00.97 | +15:31:58.6 | HIP 86816 | 28.85 |
| 2026-10-01 00:00 | 17:44:03.22 | +15:29:47.9 | HIP 86757 | 29.53 |
| 2026-10-01 12:00 | 17:44:05.59 | +15:27:37.7 | HIP 86757 | 27.53 |
| 2026-10-02 00:00 | 17:44:08.07 | +15:25:28.0 | HIP 86757 | 25.59 |
| 2026-10-02 12:00 | 17:44:10.66 | +15:23:18.8 | HIP 86757 | 23.72 |
| 2026-10-03 00:00 | 17:44:13.36 | +15:21:10.1 | HIP 86757 | 21.94 |
| 2026-10-03 12:00 | 17:44:16.18 | +15:19:01.9 | HIP 86757 | 20.26 |
| 2026-10-04 00:00 | 17:44:19.10 | +15:16:54.2 | HIP 86757 | 18.73 |
| 2026-10-04 12:00 | 17:44:22.12 | +15:14:47.1 | HIP 86757 | 17.38 |
| 2026-10-05 00:00 | 17:44:25.26 | +15:12:40.4 | HIP 86757 | 16.25 |
| 2026-10-05 12:00 | 17:44:28.51 | +15:10:34.4 | HIP 86757 | 15.39 |
| 2026-10-06 00:00 | 17:44:31.86 | +15:08:28.8 | HIP 86757 | 14.85 |
| 2026-10-06 12:00 | 17:44:35.31 | +15:06:23.9 | HIP 86757 | 14.66 |
| 2026-10-07 00:00 | 17:44:38.88 | +15:04:19.5 | HIP 86757 | 14.85 |
| 2026-10-07 12:00 | 17:44:42.55 | +15:02:15.6 | HIP 86757 | 15.39 |
| 2026-10-08 00:00 | 17:44:46.32 | +15:00:12.3 | HIP 86757 | 16.25 |
| 2026-10-08 12:00 | 17:44:50.20 | +14:58:09.6 | HIP 86757 | 17.38 |
| 2026-10-09 00:00 | 17:44:54.18 | +14:56:07.5 | HIP 86757 | 18.74 |
| 2026-10-09 12:00 | 17:44:58.26 | +14:54:06.0 | HIP 86757 | 20.28 |
| 2026-10-10 00:00 | 17:45:02.44 | +14:52:05.1 | HIP 86757 | 21.96 |
| 2026-10-10 12:00 | 17:45:06.73 | +14:50:04.8 | HIP 86996 | 22.84 |
| 2026-10-11 00:00 | 17:45:11.11 | +14:48:05.1 | HIP 86996 | 21.57 |