C/2023 R1 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2023 R1 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-04-13T10:52:38.942400Z |
| Orbit solution date (soln_date, UTC) | 2026-09-08T09:12:17Z |
| Obs used | 4787 |
| NEO | - |
| M1 | 7.400 |
| K1 | 8.750 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2023-09-07T13:40:49.296000Z |
| Discovery magnitude (MPC) | 20.17 w |
| Discovery observatory (MPC) | F52 · Pan-STARRS 2, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-08-27.0000000 |
| e | 1.00229606 |
| q (au) | 3.569890 |
| a (au) | -1554.792817 |
| i (deg) | 149.316786 |
| Ω (om, deg) | 62.564028 |
| ω (w, deg) | 144.270457 |
| M (ma, deg) | -0.003689 |
等級
散乱 + 全体線形
$$ M_a = (5.568 + 4.139\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 5.568 |
| n | 4.139 |
| gf | 1.000 |
| gb | -0.940 |
| 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 |
|---|---|---|---|
| 2023-07-29 | 2024-08-15 | +5.5838 | -4.866 |
| 2024-08-15 | 2025-05-30 | -0.6921 | +0.390 |
| 2025-05-30 | 2025-09-19 | -16.1373 | +10.617 |
| 2025-09-19 | 2026-04-12 | +20.4428 | -11.427 |
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 | 15:27:22.54 | -16:45:25.7 | HIP 75730 | 12.89 |
| 2026-09-20 12:00 | 15:27:20.44 | -16:48:01.7 | HIP 75730 | 14.09 |
| 2026-09-21 00:00 | 15:27:18.53 | -16:50:37.6 | HIP 75730 | 15.61 |
| 2026-09-21 12:00 | 15:27:16.83 | -16:53:13.4 | HIP 75730 | 17.36 |
| 2026-09-22 00:00 | 15:27:15.32 | -16:55:49.2 | HIP 75730 | 19.27 |
| 2026-09-22 12:00 | 15:27:14.01 | -16:58:24.9 | HIP 75730 | 21.30 |
| 2026-09-23 00:00 | 15:27:12.89 | -17:01:00.5 | HIP 75730 | 23.42 |
| 2026-09-23 12:00 | 15:27:11.96 | -17:03:36.1 | HIP 75506 | 25.46 |
| 2026-09-24 00:00 | 15:27:11.22 | -17:06:11.5 | HIP 75506 | 25.20 |
| 2026-09-24 12:00 | 15:27:10.67 | -17:08:46.9 | HIP 75506 | 25.26 |
| 2026-09-25 00:00 | 15:27:10.30 | -17:11:22.3 | HIP 75506 | 25.62 |
| 2026-09-25 12:00 | 15:27:10.11 | -17:13:57.6 | HIP 75506 | 26.27 |
| 2026-09-26 00:00 | 15:27:10.10 | -17:16:32.8 | HIP 75506 | 27.19 |
| 2026-09-26 12:00 | 15:27:10.27 | -17:19:07.9 | HIP 75798 | 28.18 |
| 2026-09-27 00:00 | 15:27:10.61 | -17:21:43.0 | HIP 75798 | 27.87 |
| 2026-09-27 12:00 | 15:27:11.13 | -17:24:18.0 | HIP 75798 | 27.75 |
| 2026-09-28 00:00 | 15:27:11.82 | -17:26:53.0 | HIP 75798 | 27.83 |
| 2026-09-28 12:00 | 15:27:12.68 | -17:29:27.9 | HIP 75798 | 28.11 |
| 2026-09-29 00:00 | 15:27:13.70 | -17:32:02.8 | HIP 75798 | 28.59 |
| 2026-09-29 12:00 | 15:27:14.89 | -17:34:37.5 | HIP 75601 | 26.17 |
| 2026-09-30 00:00 | 15:27:16.25 | -17:37:12.3 | HIP 75601 | 23.78 |
| 2026-09-30 12:00 | 15:27:17.76 | -17:39:47.0 | HIP 75601 | 21.45 |
| 2026-10-01 00:00 | 15:27:19.44 | -17:42:21.6 | HIP 75601 | 19.21 |
| 2026-10-01 12:00 | 15:27:21.27 | -17:44:56.2 | HIP 75601 | 17.08 |
| 2026-10-02 00:00 | 15:27:23.26 | -17:47:30.7 | HIP 75601 | 15.14 |
| 2026-10-02 12:00 | 15:27:25.41 | -17:50:05.1 | HIP 75601 | 13.45 |
| 2026-10-03 00:00 | 15:27:27.70 | -17:52:39.5 | HIP 75601 | 12.12 |
| 2026-10-03 12:00 | 15:27:30.15 | -17:55:13.9 | HIP 75601 | 11.30 |
| 2026-10-04 00:00 | 15:27:32.75 | -17:57:48.2 | HIP 75601 | 11.10 |
| 2026-10-04 12:00 | 15:27:35.49 | -18:00:22.5 | HIP 75601 | 11.55 |
| 2026-10-05 00:00 | 15:27:38.38 | -18:02:56.7 | HIP 75601 | 12.59 |
| 2026-10-05 12:00 | 15:27:41.41 | -18:05:30.9 | HIP 75601 | 14.09 |
| 2026-10-06 00:00 | 15:27:44.58 | -18:08:05.0 | HIP 75601 | 15.93 |
| 2026-10-06 12:00 | 15:27:47.90 | -18:10:39.1 | HIP 75601 | 18.01 |
| 2026-10-07 00:00 | 15:27:51.35 | -18:13:13.1 | HIP 75601 | 20.26 |
| 2026-10-07 12:00 | 15:27:54.93 | -18:15:47.1 | HIP 75664 | 20.13 |
| 2026-10-08 00:00 | 15:27:58.65 | -18:18:21.0 | HIP 75664 | 17.94 |
| 2026-10-08 12:00 | 15:28:02.50 | -18:20:54.9 | HIP 75664 | 15.93 |
| 2026-10-09 00:00 | 15:28:06.49 | -18:23:28.7 | HIP 75664 | 14.18 |
| 2026-10-09 12:00 | 15:28:10.60 | -18:26:02.5 | HIP 75664 | 12.79 |
| 2026-10-10 00:00 | 15:28:14.83 | -18:28:36.2 | HIP 75664 | 11.92 |
| 2026-10-10 12:00 | 15:28:19.19 | -18:31:09.9 | HIP 75664 | 11.67 |
| 2026-10-11 00:00 | 15:28:23.68 | -18:33:43.5 | HIP 75768 | 10.72 |