C/2024 R4 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 R4 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-10-26T15:43:43.631040Z |
| Orbit solution date (soln_date, UTC) | 2026-05-08T13:42:11Z |
| Obs used | 1030 |
| NEO | - |
| M1 | 6.300 |
| K1 | 7.750 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-09-11T08:54:09.475200Z |
| Discovery magnitude (MPC) | 21.20 w |
| Discovery observatory (MPC) | F51 · Pan-STARRS 1, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-09-09.0000000 |
| e | 1.00260247 |
| q (au) | 4.408984 |
| a (au) | -1694.150574 |
| i (deg) | 95.367202 |
| Ω (om, deg) | 345.937422 |
| ω (w, deg) | 108.995561 |
| M (ma, deg) | -0.010992 |
等級
散乱 + 全体線形
$$ M_a = (-0.991 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | -0.991 |
| n | 6.000 |
| gf | 0.988 |
| gb | -0.811 |
| 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 |
|---|---|---|---|
| 2024-07-03 | 2025-07-23 | +19.1168 | -17.056 |
| 2025-07-23 | 2026-05-09 | -3.0054 | +2.549 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 22:14:54.66 | +35:17:04.4 | HIP 109916 | 19.41 |
| 2026-05-12 12:00 | 22:14:54.61 | +35:22:31.1 | HIP 109916 | 14.95 |
| 2026-05-13 00:00 | 22:14:54.38 | +35:27:58.3 | HIP 109827 | 10.42 |
| 2026-05-13 12:00 | 22:14:53.97 | +35:33:26.1 | HIP 109827 | 5.36 |
| 2026-05-14 00:00 | 22:14:53.39 | +35:38:54.5 | HIP 109827 | 2.90 |
| 2026-05-14 12:00 | 22:14:52.63 | +35:44:23.4 | HIP 109827 | 6.92 |
| 2026-05-15 00:00 | 22:14:51.68 | +35:49:52.8 | HIP 109827 | 12.15 |
| 2026-05-15 12:00 | 22:14:50.55 | +35:55:22.7 | HIP 109834 | 13.97 |
| 2026-05-16 00:00 | 22:14:49.24 | +36:00:53.2 | HIP 109834 | 8.46 |
| 2026-05-16 12:00 | 22:14:47.74 | +36:06:24.1 | HIP 109834 | 2.94 |
| 2026-05-17 00:00 | 22:14:46.05 | +36:11:55.6 | HIP 109834 | 2.60 |
| 2026-05-17 12:00 | 22:14:44.17 | +36:17:27.5 | HIP 109834 | 8.14 |
| 2026-05-18 00:00 | 22:14:42.10 | +36:22:59.8 | HIP 109834 | 13.70 |
| 2026-05-18 12:00 | 22:14:39.84 | +36:28:32.6 | HIP 109834 | 19.26 |
| 2026-05-19 00:00 | 22:14:37.38 | +36:34:05.8 | HIP 109797 | 16.12 |
| 2026-05-19 12:00 | 22:14:34.73 | +36:39:39.5 | HIP 109797 | 10.58 |
| 2026-05-20 00:00 | 22:14:31.88 | +36:45:13.6 | HIP 109797 | 5.12 |
| 2026-05-20 12:00 | 22:14:28.83 | +36:50:48.0 | HIP 109797 | 1.71 |
| 2026-05-21 00:00 | 22:14:25.58 | +36:56:22.8 | HIP 109797 | 6.52 |
| 2026-05-21 12:00 | 22:14:22.12 | +37:01:58.0 | HIP 109741 | 7.27 |
| 2026-05-22 00:00 | 22:14:18.47 | +37:07:33.6 | HIP 109741 | 8.12 |
| 2026-05-22 12:00 | 22:14:14.61 | +37:13:09.5 | HIP 109741 | 11.93 |
| 2026-05-23 00:00 | 22:14:10.54 | +37:18:45.7 | HIP 109741 | 16.80 |
| 2026-05-23 12:00 | 22:14:06.27 | +37:24:22.3 | HIP 109784 | 20.47 |
| 2026-05-24 00:00 | 22:14:01.79 | +37:29:59.1 | HIP 109784 | 15.02 |
| 2026-05-24 12:00 | 22:13:57.10 | +37:35:36.2 | HIP 109784 | 9.85 |
| 2026-05-25 00:00 | 22:13:52.19 | +37:41:13.7 | HIP 109784 | 5.81 |
| 2026-05-25 12:00 | 22:13:47.07 | +37:46:51.3 | HIP 109784 | 6.00 |
| 2026-05-26 00:00 | 22:13:41.74 | +37:52:29.3 | HIP 109784 | 10.21 |
| 2026-05-26 12:00 | 22:13:36.19 | +37:58:07.4 | HIP 109784 | 15.46 |
| 2026-05-27 00:00 | 22:13:30.42 | +38:03:45.8 | HIP 109784 | 20.99 |
| 2026-05-27 12:00 | 22:13:24.44 | +38:09:24.4 | HIP 109681 | 17.49 |
| 2026-05-28 00:00 | 22:13:18.23 | +38:15:03.2 | HIP 109681 | 11.72 |
| 2026-05-28 12:00 | 22:13:11.80 | +38:20:42.2 | HIP 109681 | 5.93 |
| 2026-05-29 00:00 | 22:13:05.14 | +38:26:21.3 | HIP 109681 | 0.14 |
| 2026-05-29 12:00 | 22:12:58.26 | +38:32:00.6 | HIP 109681 | 5.69 |
| 2026-05-30 00:00 | 22:12:51.15 | +38:37:40.1 | HIP 109681 | 11.51 |
| 2026-05-30 12:00 | 22:12:43.82 | +38:43:19.7 | HIP 109681 | 17.35 |
| 2026-05-31 00:00 | 22:12:36.25 | +38:48:59.3 | HIP 109581 | 15.65 |
| 2026-05-31 12:00 | 22:12:28.45 | +38:54:39.1 | HIP 109581 | 10.16 |
| 2026-06-01 00:00 | 22:12:20.42 | +39:00:18.9 | HIP 109581 | 5.48 |
| 2026-06-01 12:00 | 22:12:12.15 | +39:05:58.8 | HIP 109581 | 5.06 |
| 2026-06-02 00:00 | 22:12:03.65 | +39:11:38.8 | HIP 109581 | 9.50 |