C/2023 R1 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2023 R1 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-04-13T12:39:52.381440Z |
| Orbit solution date (soln_date, UTC) | 2026-01-07T15:42:42Z |
| Obs used | 2886 |
| NEO | - |
| M1 | 10.000 |
| K1 | 5.250 |
| PC | - |
| 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) | 2025-02-17.0000000 |
| e | 1.00206432 |
| q (au) | 3.569570 |
| a (au) | -1729.176273 |
| i (deg) | 149.316539 |
| Ω (om, deg) | 62.557542 |
| ω (w, deg) | 144.278219 |
| M (ma, deg) | -0.005764 |
等級
散乱 + 全体線形
$$ M_a = (10.858 + 2.208\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 10.858 |
| n | 2.208 |
| gf | 0.986 |
| gb | -0.542 |
| k | 0.800 |
| δ90 | 8.738 |
| 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 | +7.4692 | -6.158 |
| 2024-08-15 | 2025-01-20 | +1.1221 | -0.967 |
| 2025-01-20 | 2025-12-16 | -4.1030 | +2.641 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 19:30:47.84 | -03:08:00.2 | HIP 95909 | 8.12 |
| 2026-02-03 12:00 | 19:30:55.44 | -03:08:37.8 | HIP 95909 | 9.75 |
| 2026-02-04 00:00 | 19:31:02.97 | -03:09:14.8 | HIP 95909 | 11.48 |
| 2026-02-04 12:00 | 19:31:10.43 | -03:09:51.0 | HIP 95909 | 13.26 |
| 2026-02-05 00:00 | 19:31:17.80 | -03:10:26.5 | HIP 95909 | 15.06 |
| 2026-02-05 12:00 | 19:31:25.10 | -03:11:01.2 | HIP 95909 | 16.88 |
| 2026-02-06 00:00 | 19:31:32.31 | -03:11:35.3 | HIP 95909 | 18.69 |
| 2026-02-06 12:00 | 19:31:39.44 | -03:12:08.6 | HIP 95909 | 20.49 |
| 2026-02-07 00:00 | 19:31:46.48 | -03:12:41.2 | HIP 95909 | 22.28 |
| 2026-02-07 12:00 | 19:31:53.44 | -03:13:13.1 | HIP 95909 | 24.06 |
| 2026-02-08 00:00 | 19:32:00.31 | -03:13:44.4 | HIP 95909 | 25.82 |
| 2026-02-08 12:00 | 19:32:07.09 | -03:14:14.9 | HIP 95909 | 27.56 |
| 2026-02-09 00:00 | 19:32:13.77 | -03:14:44.8 | HIP 95909 | 29.28 |
| 2026-02-09 12:00 | 19:32:20.37 | -03:15:14.0 | HIP 96197 | 29.47 |
| 2026-02-10 00:00 | 19:32:26.86 | -03:15:42.5 | HIP 96197 | 28.06 |
| 2026-02-10 12:00 | 19:32:33.26 | -03:16:10.4 | HIP 96197 | 26.72 |
| 2026-02-11 00:00 | 19:32:39.56 | -03:16:37.7 | HIP 96197 | 25.43 |
| 2026-02-11 12:00 | 19:32:45.76 | -03:17:04.3 | HIP 96197 | 24.21 |
| 2026-02-12 00:00 | 19:32:51.86 | -03:17:30.3 | HIP 96197 | 23.07 |
| 2026-02-12 12:00 | 19:32:57.85 | -03:17:55.6 | HIP 96197 | 21.99 |
| 2026-02-13 00:00 | 19:33:03.73 | -03:18:20.4 | HIP 96197 | 20.99 |
| 2026-02-13 12:00 | 19:33:09.50 | -03:18:44.5 | HIP 96197 | 20.09 |
| 2026-02-14 00:00 | 19:33:15.17 | -03:19:08.1 | HIP 96197 | 19.27 |
| 2026-02-14 12:00 | 19:33:20.72 | -03:19:31.1 | HIP 96197 | 18.54 |
| 2026-02-15 00:00 | 19:33:26.15 | -03:19:53.4 | HIP 96197 | 17.92 |
| 2026-02-15 12:00 | 19:33:31.47 | -03:20:15.3 | HIP 96197 | 17.40 |
| 2026-02-16 00:00 | 19:33:36.67 | -03:20:36.5 | HIP 96197 | 16.99 |
| 2026-02-16 12:00 | 19:33:41.75 | -03:20:57.2 | HIP 96197 | 16.68 |
| 2026-02-17 00:00 | 19:33:46.71 | -03:21:17.4 | HIP 96197 | 16.48 |
| 2026-02-17 12:00 | 19:33:51.54 | -03:21:37.0 | HIP 96197 | 16.37 |
| 2026-02-18 00:00 | 19:33:56.24 | -03:21:56.1 | HIP 96197 | 16.36 |
| 2026-02-18 12:00 | 19:34:00.82 | -03:22:14.7 | HIP 96197 | 16.44 |
| 2026-02-19 00:00 | 19:34:05.26 | -03:22:32.8 | HIP 96197 | 16.59 |
| 2026-02-19 12:00 | 19:34:09.57 | -03:22:50.4 | HIP 96197 | 16.82 |
| 2026-02-20 00:00 | 19:34:13.75 | -03:23:07.5 | HIP 96197 | 17.10 |
| 2026-02-20 12:00 | 19:34:17.78 | -03:23:24.2 | HIP 96197 | 17.43 |
| 2026-02-21 00:00 | 19:34:21.68 | -03:23:40.3 | HIP 96197 | 17.80 |
| 2026-02-21 12:00 | 19:34:25.44 | -03:23:56.1 | HIP 96197 | 18.20 |
| 2026-02-22 00:00 | 19:34:29.05 | -03:24:11.3 | HIP 96197 | 18.62 |
| 2026-02-22 12:00 | 19:34:32.52 | -03:24:26.2 | HIP 96197 | 19.06 |
| 2026-02-23 00:00 | 19:34:35.84 | -03:24:40.6 | HIP 96197 | 19.51 |
| 2026-02-23 12:00 | 19:34:39.01 | -03:24:54.6 | HIP 96197 | 19.96 |
| 2026-02-24 00:00 | 19:34:42.03 | -03:25:08.1 | HIP 96197 | 20.41 |