C/2004 F4 (Bradfield)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2004 F4 (Bradfield) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2004-04-17T02:09:33.935040Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:39Z |
| Obs used | 301 |
| NEO | - |
| M1 | 11.300 |
| K1 | 17.500 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2004-06-01.0000000 |
| e | 0.99929199 |
| q (au) | 0.168266 |
| a (au) | 237.660852 |
| i (deg) | 63.164572 |
| Ω (om, deg) | 222.778071 |
| ω (w, deg) | 332.785994 |
| M (ma, deg) | 0.012081 |
等級
散乱 + 全体線形
$$ M_a = (9.967 + 5.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 9.967 |
| n | 5.380 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2004-04-23 | 2004-05-15 | -5.2656 | -1.652 |
| 2004-05-15 | 2004-05-23 | -1.8271 | -0.827 |
| 2004-05-23 | 2004-06-14 | +10.0517 | -0.961 |
| 2004-06-14 | 2004-07-22 | -4.3284 | +1.967 |
| 2004-07-22 | 2004-09-01 | -1.5777 | +1.352 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 00:37:55.70 | +36:44:30.0 | HIP 3046 | 13.01 |
| 2026-02-03 12:00 | 00:37:57.50 | +36:44:18.5 | HIP 3046 | 12.62 |
| 2026-02-04 00:00 | 00:37:59.32 | +36:44:07.3 | HIP 3046 | 12.22 |
| 2026-02-04 12:00 | 00:38:01.17 | +36:43:56.3 | HIP 3046 | 11.83 |
| 2026-02-05 00:00 | 00:38:03.03 | +36:43:45.5 | HIP 3046 | 11.44 |
| 2026-02-05 12:00 | 00:38:04.92 | +36:43:34.9 | HIP 3046 | 11.05 |
| 2026-02-06 00:00 | 00:38:06.83 | +36:43:24.6 | HIP 3046 | 10.66 |
| 2026-02-06 12:00 | 00:38:08.76 | +36:43:14.4 | HIP 3046 | 10.27 |
| 2026-02-07 00:00 | 00:38:10.71 | +36:43:04.5 | HIP 3046 | 9.89 |
| 2026-02-07 12:00 | 00:38:12.68 | +36:42:54.8 | HIP 3046 | 9.51 |
| 2026-02-08 00:00 | 00:38:14.68 | +36:42:45.3 | HIP 3046 | 9.13 |
| 2026-02-08 12:00 | 00:38:16.69 | +36:42:36.0 | HIP 3046 | 8.76 |
| 2026-02-09 00:00 | 00:38:18.72 | +36:42:26.9 | HIP 3046 | 8.40 |
| 2026-02-09 12:00 | 00:38:20.78 | +36:42:18.0 | HIP 3046 | 8.04 |
| 2026-02-10 00:00 | 00:38:22.86 | +36:42:09.4 | HIP 3046 | 7.69 |
| 2026-02-10 12:00 | 00:38:24.95 | +36:42:01.0 | HIP 3046 | 7.36 |
| 2026-02-11 00:00 | 00:38:27.07 | +36:41:52.8 | HIP 3046 | 7.03 |
| 2026-02-11 12:00 | 00:38:29.20 | +36:41:44.8 | HIP 3046 | 6.73 |
| 2026-02-12 00:00 | 00:38:31.36 | +36:41:37.0 | HIP 3046 | 6.44 |
| 2026-02-12 12:00 | 00:38:33.54 | +36:41:29.5 | HIP 3046 | 6.17 |
| 2026-02-13 00:00 | 00:38:35.73 | +36:41:22.2 | HIP 3046 | 5.93 |
| 2026-02-13 12:00 | 00:38:37.94 | +36:41:15.1 | HIP 3046 | 5.72 |
| 2026-02-14 00:00 | 00:38:40.18 | +36:41:08.2 | HIP 3046 | 5.54 |
| 2026-02-14 12:00 | 00:38:42.43 | +36:41:01.5 | HIP 3046 | 5.40 |
| 2026-02-15 00:00 | 00:38:44.70 | +36:40:55.1 | HIP 3046 | 5.30 |
| 2026-02-15 12:00 | 00:38:46.99 | +36:40:48.9 | HIP 3046 | 5.24 |
| 2026-02-16 00:00 | 00:38:49.30 | +36:40:42.9 | HIP 3046 | 5.23 |
| 2026-02-16 12:00 | 00:38:51.62 | +36:40:37.1 | HIP 3046 | 5.27 |
| 2026-02-17 00:00 | 00:38:53.97 | +36:40:31.6 | HIP 3046 | 5.36 |
| 2026-02-17 12:00 | 00:38:56.33 | +36:40:26.3 | HIP 3046 | 5.49 |
| 2026-02-18 00:00 | 00:38:58.71 | +36:40:21.2 | HIP 3046 | 5.66 |
| 2026-02-18 12:00 | 00:39:01.10 | +36:40:16.3 | HIP 3046 | 5.88 |
| 2026-02-19 00:00 | 00:39:03.51 | +36:40:11.7 | HIP 3046 | 6.13 |
| 2026-02-19 12:00 | 00:39:05.95 | +36:40:07.2 | HIP 3046 | 6.41 |
| 2026-02-20 00:00 | 00:39:08.39 | +36:40:03.0 | HIP 3046 | 6.72 |
| 2026-02-20 12:00 | 00:39:10.86 | +36:39:59.0 | HIP 3046 | 7.06 |
| 2026-02-21 00:00 | 00:39:13.34 | +36:39:55.3 | HIP 3046 | 7.42 |
| 2026-02-21 12:00 | 00:39:15.83 | +36:39:51.8 | HIP 3046 | 7.81 |
| 2026-02-22 00:00 | 00:39:18.35 | +36:39:48.4 | HIP 3046 | 8.21 |
| 2026-02-22 12:00 | 00:39:20.87 | +36:39:45.4 | HIP 3109 | 8.21 |
| 2026-02-23 00:00 | 00:39:23.42 | +36:39:42.5 | HIP 3109 | 8.09 |
| 2026-02-23 12:00 | 00:39:25.98 | +36:39:39.9 | HIP 3109 | 7.99 |
| 2026-02-24 00:00 | 00:39:28.55 | +36:39:37.4 | HIP 3109 | 7.93 |