49P/Arend-Rigaux
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 49P/Arend-Rigaux |
| Type | P |
| Perihelion (tp_cal, UTC) | 2011-10-19T07:09:47.998080Z |
| Orbit solution date (soln_date, UTC) | 2026-07-07T05:51:46Z |
| Obs used | 4486 |
| NEO | - |
| M1 | 13.900 |
| K1 | 6.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-02-02.0000000 |
| e | 0.60017016 |
| q (au) | 1.426129 |
| a (au) | 3.566839 |
| i (deg) | 19.056641 |
| Ω (om, deg) | 118.831084 |
| ω (w, deg) | 332.927303 |
| M (ma, deg) | 175.822888 |
等級
散乱 + 全体線形
$$ M_a = (11.888 + 5.474\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.888 |
| n | 5.474 |
| gf | 0.983 |
| gb | -0.920 |
| k | 0.986 |
| 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 |
|---|---|---|---|
| 2023-05-02 | 2024-11-21 | +7.2269 | -1.762 |
| 2024-11-21 | 2024-08-28 | -0.4935 | +0.400 |
| 2024-08-28 | 2023-10-24 | -10.9208 | +4.536 |
| 2023-10-24 | 2026-03-18 | +46.5140 | -31.880 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 14:31:10.15 | +04:33:54.2 | HIP 70949 | 13.88 |
| 2026-07-29 12:00 | 14:31:20.27 | +04:30:28.1 | HIP 70949 | 18.09 |
| 2026-07-30 00:00 | 14:31:30.56 | +04:27:01.8 | HIP 71085 | 21.30 |
| 2026-07-30 12:00 | 14:31:41.04 | +04:23:35.3 | HIP 71085 | 17.03 |
| 2026-07-31 00:00 | 14:31:51.70 | +04:20:08.6 | HIP 71085 | 12.76 |
| 2026-07-31 12:00 | 14:32:02.53 | +04:16:41.7 | HIP 71085 | 8.56 |
| 2026-08-01 00:00 | 14:32:13.54 | +04:13:14.7 | HIP 71085 | 4.71 |
| 2026-08-01 12:00 | 14:32:24.73 | +04:09:47.6 | HIP 71085 | 3.19 |
| 2026-08-02 00:00 | 14:32:36.09 | +04:06:20.3 | HIP 71085 | 6.17 |
| 2026-08-02 12:00 | 14:32:47.63 | +04:02:52.9 | HIP 71085 | 10.33 |
| 2026-08-03 00:00 | 14:32:59.34 | +03:59:25.4 | HIP 71085 | 14.72 |
| 2026-08-03 12:00 | 14:33:11.22 | +03:55:57.7 | HIP 71141 | 16.74 |
| 2026-08-04 00:00 | 14:33:23.27 | +03:52:30.0 | HIP 71141 | 14.42 |
| 2026-08-04 12:00 | 14:33:35.49 | +03:49:02.1 | HIP 71141 | 13.36 |
| 2026-08-05 00:00 | 14:33:47.88 | +03:45:34.2 | HIP 71141 | 13.88 |
| 2026-08-05 12:00 | 14:34:00.43 | +03:42:06.2 | HIP 71141 | 15.85 |
| 2026-08-06 00:00 | 14:34:13.15 | +03:38:38.1 | HIP 71141 | 18.85 |
| 2026-08-06 12:00 | 14:34:26.04 | +03:35:09.9 | HIP 71227 | 16.76 |
| 2026-08-07 00:00 | 14:34:39.10 | +03:31:41.7 | HIP 71360 | 14.67 |
| 2026-08-07 12:00 | 14:34:52.31 | +03:28:13.5 | HIP 71360 | 10.92 |
| 2026-08-08 00:00 | 14:35:05.69 | +03:24:45.2 | HIP 71360 | 8.27 |
| 2026-08-08 12:00 | 14:35:19.23 | +03:21:16.8 | HIP 71360 | 7.97 |
| 2026-08-09 00:00 | 14:35:32.94 | +03:17:48.5 | HIP 71360 | 10.28 |
| 2026-08-09 12:00 | 14:35:46.80 | +03:14:20.1 | HIP 71360 | 13.98 |
| 2026-08-10 00:00 | 14:36:00.82 | +03:10:51.7 | HIP 71360 | 18.27 |
| 2026-08-10 12:00 | 14:36:15.00 | +03:07:23.3 | HIP 71455 | 18.61 |
| 2026-08-11 00:00 | 14:36:29.33 | +03:03:54.9 | HIP 71455 | 14.12 |
| 2026-08-11 12:00 | 14:36:43.82 | +03:00:26.6 | HIP 71455 | 10.10 |
| 2026-08-12 00:00 | 14:36:58.47 | +02:56:58.2 | HIP 71455 | 7.44 |
| 2026-08-12 12:00 | 14:37:13.27 | +02:53:29.9 | HIP 71455 | 7.75 |
| 2026-08-13 00:00 | 14:37:28.22 | +02:50:01.7 | HIP 71455 | 10.81 |
| 2026-08-13 12:00 | 14:37:43.33 | +02:46:33.4 | HIP 71455 | 15.07 |
| 2026-08-14 00:00 | 14:37:58.58 | +02:43:05.3 | HIP 71455 | 19.77 |
| 2026-08-14 12:00 | 14:38:13.98 | +02:39:37.2 | HIP 71643 | 18.89 |
| 2026-08-15 00:00 | 14:38:29.54 | +02:36:09.2 | HIP 71643 | 13.73 |
| 2026-08-15 12:00 | 14:38:45.23 | +02:32:41.3 | HIP 71643 | 8.60 |
| 2026-08-16 00:00 | 14:39:01.08 | +02:29:13.5 | HIP 71643 | 3.72 |
| 2026-08-16 12:00 | 14:39:17.07 | +02:25:45.8 | HIP 71643 | 3.00 |
| 2026-08-17 00:00 | 14:39:33.20 | +02:22:18.2 | HIP 71643 | 7.77 |
| 2026-08-17 12:00 | 14:39:49.47 | +02:18:50.7 | HIP 71643 | 12.99 |
| 2026-08-18 00:00 | 14:40:05.89 | +02:15:23.3 | HIP 71643 | 18.30 |
| 2026-08-18 12:00 | 14:40:22.44 | +02:11:56.1 | HIP 71643 | 23.65 |
| 2026-08-19 00:00 | 14:40:39.14 | +02:08:29.0 | HIP 71643 | 29.04 |