C/2024 R4 (PANSTARRS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 R4 (PANSTARRS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-10-26T15:56:50.406720Z |
| Orbit solution date (soln_date, UTC) | 2026-05-28T12:12:15Z |
| Obs used | 1127 |
| NEO | - |
| M1 | 6.000 |
| K1 | 8.000 |
| 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) | 2025-10-01.0000000 |
| e | 1.00258620 |
| q (au) | 4.408938 |
| a (au) | -1704.791833 |
| i (deg) | 95.368617 |
| Ω (om, deg) | 345.938247 |
| ω (w, deg) | 108.996772 |
| M (ma, deg) | -0.010581 |
等級
散乱 + 全体線形
$$ M_a = (1.602 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 1.602 |
| n | 6.000 |
| gf | 0.992 |
| gb | -0.598 |
| k | 0.800 |
| δ90 | 9.999 |
| 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 | 2025-04-28 | +24.6609 | -22.438 |
| 2025-04-28 | 2025-12-26 | +4.0951 | -3.597 |
| 2025-12-26 | 2026-06-08 | -6.8197 | +5.633 |
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) |
|---|---|---|---|---|
| 2026-06-01 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 |
| 2026-06-02 12:00 | 22:11:54.90 | +39:17:18.8 | HIP 109619 | 10.05 |
| 2026-06-03 00:00 | 22:11:45.92 | +39:22:58.8 | HIP 109619 | 7.50 |
| 2026-06-03 12:00 | 22:11:36.69 | +39:28:38.8 | HIP 109619 | 9.09 |
| 2026-06-04 00:00 | 22:11:27.23 | +39:34:18.7 | HIP 109543 | 8.45 |
| 2026-06-04 12:00 | 22:11:17.51 | +39:39:58.7 | HIP 109543 | 2.84 |
| 2026-06-05 00:00 | 22:11:07.55 | +39:45:38.5 | HIP 109543 | 4.00 |
| 2026-06-05 12:00 | 22:10:57.34 | +39:51:18.3 | HIP 109543 | 9.79 |
| 2026-06-06 00:00 | 22:10:46.89 | +39:56:58.0 | HIP 109535 | 14.29 |
| 2026-06-06 12:00 | 22:10:36.18 | +40:02:37.6 | HIP 109535 | 10.68 |
| 2026-06-07 00:00 | 22:10:25.21 | +40:08:17.1 | HIP 109473 | 7.94 |
| 2026-06-07 12:00 | 22:10:13.99 | +40:13:56.4 | HIP 109473 | 5.01 |
| 2026-06-08 00:00 | 22:10:02.52 | +40:19:35.5 | HIP 109473 | 7.81 |
| 2026-06-08 12:00 | 22:09:50.79 | +40:25:14.5 | HIP 109473 | 13.07 |
| 2026-06-09 00:00 | 22:09:38.79 | +40:30:53.2 | HIP 109473 | 18.86 |
| 2026-06-09 12:00 | 22:09:26.54 | +40:36:31.7 | HIP 109420 | 20.22 |
| 2026-06-10 00:00 | 22:09:14.02 | +40:42:10.0 | HIP 109420 | 16.51 |
| 2026-06-10 12:00 | 22:09:01.24 | +40:47:47.9 | HIP 109420 | 14.58 |
| 2026-06-11 00:00 | 22:08:48.19 | +40:53:25.6 | HIP 109420 | 15.14 |
| 2026-06-11 12:00 | 22:08:34.87 | +40:59:03.0 | HIP 109420 | 17.96 |
| 2026-06-12 00:00 | 22:08:21.29 | +41:04:40.0 | HIP 109420 | 22.22 |
| 2026-06-12 12:00 | 22:08:07.43 | +41:10:16.6 | HIP 109242 | 26.65 |
| 2026-06-13 00:00 | 22:07:53.30 | +41:15:52.9 | HIP 109242 | 20.88 |
| 2026-06-13 12:00 | 22:07:38.89 | +41:21:28.7 | HIP 109242 | 15.46 |
| 2026-06-14 00:00 | 22:07:24.21 | +41:27:04.1 | HIP 109242 | 10.95 |
| 2026-06-14 12:00 | 22:07:09.26 | +41:32:39.0 | HIP 109242 | 8.90 |
| 2026-06-15 00:00 | 22:06:54.02 | +41:38:13.4 | HIP 109242 | 10.83 |
| 2026-06-15 12:00 | 22:06:38.51 | +41:43:47.3 | HIP 109242 | 15.33 |
| 2026-06-16 00:00 | 22:06:22.71 | +41:49:20.7 | HIP 109080 | 10.33 |
| 2026-06-16 12:00 | 22:06:06.63 | +41:54:53.5 | HIP 109080 | 4.14 |
| 2026-06-17 00:00 | 22:05:50.27 | +42:00:25.8 | HIP 109080 | 2.63 |
| 2026-06-17 12:00 | 22:05:33.63 | +42:05:57.4 | HIP 109080 | 8.76 |
| 2026-06-18 00:00 | 22:05:16.69 | +42:11:28.3 | HIP 109080 | 15.07 |
| 2026-06-18 12:00 | 22:04:59.48 | +42:16:58.6 | HIP 109080 | 21.41 |
| 2026-06-19 00:00 | 22:04:41.97 | +42:22:28.3 | HIP 108865 | 19.81 |
| 2026-06-19 12:00 | 22:04:24.18 | +42:27:57.2 | HIP 108865 | 14.18 |
| 2026-06-20 00:00 | 22:04:06.09 | +42:33:25.3 | HIP 108865 | 9.51 |
| 2026-06-20 12:00 | 22:03:47.72 | +42:38:52.7 | HIP 108865 | 7.82 |
| 2026-06-21 00:00 | 22:03:29.05 | +42:44:19.3 | HIP 108819 | 9.38 |
| 2026-06-21 12:00 | 22:03:10.09 | +42:49:45.1 | HIP 108819 | 4.80 |
| 2026-06-22 00:00 | 22:02:50.84 | +42:55:10.1 | HIP 108819 | 6.41 |