C/1956 R1 (Arend-Roland)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1956 R1 (Arend-Roland) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1957-04-08T00:46:40.293120Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:12Z |
| Obs used | 57 |
| NEO | - |
| M1 | - |
| K1 | - |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1957-07-09.0000000 |
| e | 1.00024806 |
| q (au) | 0.316043 |
| a (au) | -1274.056032 |
| i (deg) | 119.944301 |
| Ω (om, deg) | 215.855361 |
| ω (w, deg) | 308.774543 |
| M (ma, deg) | 0.001993 |
等級
散乱 + 全体線形
$$ M_a = (5.382 + 3.093\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 5.382 |
| n | 3.093 |
| 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 |
|---|---|---|---|
| 1956-11-20 | 1957-04-06 | -0.6577 | +0.271 |
| 1957-04-10 | 1957-05-20 | -2.0830 | -0.252 |
| 1957-05-20 | 1957-05-30 | -10.4996 | +0.237 |
| 1957-05-30 | 1957-12-03 | +5.1007 | -1.102 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 04:04:05.74 | +68:53:39.3 | HIP 18800 | 13.37 |
| 2026-07-29 12:00 | 04:04:07.23 | +68:53:52.4 | HIP 18800 | 13.55 |
| 2026-07-30 00:00 | 04:04:08.68 | +68:54:05.5 | HIP 18800 | 13.73 |
| 2026-07-30 12:00 | 04:04:10.12 | +68:54:18.6 | HIP 18800 | 13.91 |
| 2026-07-31 00:00 | 04:04:11.53 | +68:54:31.8 | HIP 18800 | 14.09 |
| 2026-07-31 12:00 | 04:04:12.91 | +68:54:45.0 | HIP 18800 | 14.27 |
| 2026-08-01 00:00 | 04:04:14.27 | +68:54:58.3 | HIP 18800 | 14.45 |
| 2026-08-01 12:00 | 04:04:15.61 | +68:55:11.5 | HIP 18800 | 14.63 |
| 2026-08-02 00:00 | 04:04:16.92 | +68:55:24.8 | HIP 18800 | 14.81 |
| 2026-08-02 12:00 | 04:04:18.20 | +68:55:38.2 | HIP 18800 | 14.99 |
| 2026-08-03 00:00 | 04:04:19.46 | +68:55:51.5 | HIP 18800 | 15.17 |
| 2026-08-03 12:00 | 04:04:20.70 | +68:56:04.9 | HIP 18800 | 15.34 |
| 2026-08-04 00:00 | 04:04:21.91 | +68:56:18.3 | HIP 18800 | 15.52 |
| 2026-08-04 12:00 | 04:04:23.09 | +68:56:31.7 | HIP 18800 | 15.70 |
| 2026-08-05 00:00 | 04:04:24.25 | +68:56:45.2 | HIP 18800 | 15.88 |
| 2026-08-05 12:00 | 04:04:25.38 | +68:56:58.7 | HIP 18800 | 16.06 |
| 2026-08-06 00:00 | 04:04:26.49 | +68:57:12.2 | HIP 18800 | 16.24 |
| 2026-08-06 12:00 | 04:04:27.57 | +68:57:25.7 | HIP 18800 | 16.42 |
| 2026-08-07 00:00 | 04:04:28.62 | +68:57:39.3 | HIP 18800 | 16.60 |
| 2026-08-07 12:00 | 04:04:29.65 | +68:57:52.8 | HIP 18800 | 16.78 |
| 2026-08-08 00:00 | 04:04:30.65 | +68:58:06.4 | HIP 18800 | 16.95 |
| 2026-08-08 12:00 | 04:04:31.62 | +68:58:20.0 | HIP 18800 | 17.13 |
| 2026-08-09 00:00 | 04:04:32.57 | +68:58:33.7 | HIP 18800 | 17.31 |
| 2026-08-09 12:00 | 04:04:33.49 | +68:58:47.3 | HIP 18800 | 17.48 |
| 2026-08-10 00:00 | 04:04:34.39 | +68:59:01.0 | HIP 18800 | 17.66 |
| 2026-08-10 12:00 | 04:04:35.25 | +68:59:14.6 | HIP 18800 | 17.83 |
| 2026-08-11 00:00 | 04:04:36.09 | +68:59:28.3 | HIP 18800 | 18.01 |
| 2026-08-11 12:00 | 04:04:36.91 | +68:59:42.0 | HIP 18800 | 18.18 |
| 2026-08-12 00:00 | 04:04:37.69 | +68:59:55.7 | HIP 18800 | 18.36 |
| 2026-08-12 12:00 | 04:04:38.45 | +69:00:09.5 | HIP 18800 | 18.53 |
| 2026-08-13 00:00 | 04:04:39.18 | +69:00:23.2 | HIP 18800 | 18.70 |
| 2026-08-13 12:00 | 04:04:39.89 | +69:00:36.9 | HIP 18800 | 18.87 |
| 2026-08-14 00:00 | 04:04:40.56 | +69:00:50.7 | HIP 18800 | 19.04 |
| 2026-08-14 12:00 | 04:04:41.21 | +69:01:04.4 | HIP 18800 | 19.22 |
| 2026-08-15 00:00 | 04:04:41.83 | +69:01:18.2 | HIP 18800 | 19.39 |
| 2026-08-15 12:00 | 04:04:42.42 | +69:01:31.9 | HIP 18800 | 19.55 |
| 2026-08-16 00:00 | 04:04:42.99 | +69:01:45.7 | HIP 18800 | 19.72 |
| 2026-08-16 12:00 | 04:04:43.52 | +69:01:59.4 | HIP 18800 | 19.89 |
| 2026-08-17 00:00 | 04:04:44.03 | +69:02:13.2 | HIP 18800 | 20.06 |
| 2026-08-17 12:00 | 04:04:44.51 | +69:02:27.0 | HIP 18800 | 20.22 |
| 2026-08-18 00:00 | 04:04:44.97 | +69:02:40.7 | HIP 18800 | 20.39 |
| 2026-08-18 12:00 | 04:04:45.39 | +69:02:54.5 | HIP 18800 | 20.55 |
| 2026-08-19 00:00 | 04:04:45.79 | +69:03:08.3 | HIP 18800 | 20.72 |