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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 03:52:47.01 | +68:43:03.0 | HIP 18067 | 13.93 |
| 2026-03-26 12:00 | 03:52:48.87 | +68:42:52.7 | HIP 18067 | 13.85 |
| 2026-03-27 00:00 | 03:52:50.76 | +68:42:42.5 | HIP 18067 | 13.78 |
| 2026-03-27 12:00 | 03:52:52.67 | +68:42:32.4 | HIP 18067 | 13.71 |
| 2026-03-28 00:00 | 03:52:54.61 | +68:42:22.4 | HIP 18067 | 13.65 |
| 2026-03-28 12:00 | 03:52:56.57 | +68:42:12.5 | HIP 18067 | 13.59 |
| 2026-03-29 00:00 | 03:52:58.55 | +68:42:02.6 | HIP 18067 | 13.54 |
| 2026-03-29 12:00 | 03:53:00.55 | +68:41:52.9 | HIP 18067 | 13.50 |
| 2026-03-30 00:00 | 03:53:02.57 | +68:41:43.2 | HIP 18067 | 13.47 |
| 2026-03-30 12:00 | 03:53:04.62 | +68:41:33.6 | HIP 18067 | 13.44 |
| 2026-03-31 00:00 | 03:53:06.68 | +68:41:24.2 | HIP 18067 | 13.41 |
| 2026-03-31 12:00 | 03:53:08.77 | +68:41:14.8 | HIP 18067 | 13.40 |
| 2026-04-01 00:00 | 03:53:10.88 | +68:41:05.5 | HIP 18067 | 13.39 |
| 2026-04-01 12:00 | 03:53:13.01 | +68:40:56.3 | HIP 18067 | 13.39 |
| 2026-04-02 00:00 | 03:53:15.16 | +68:40:47.2 | HIP 18067 | 13.40 |
| 2026-04-02 12:00 | 03:53:17.33 | +68:40:38.2 | HIP 18067 | 13.41 |
| 2026-04-03 00:00 | 03:53:19.52 | +68:40:29.3 | HIP 18067 | 13.43 |
| 2026-04-03 12:00 | 03:53:21.74 | +68:40:20.5 | HIP 18067 | 13.46 |
| 2026-04-04 00:00 | 03:53:23.97 | +68:40:11.8 | HIP 18067 | 13.49 |
| 2026-04-04 12:00 | 03:53:26.22 | +68:40:03.2 | HIP 18067 | 13.53 |
| 2026-04-05 00:00 | 03:53:28.49 | +68:39:54.7 | HIP 18067 | 13.58 |
| 2026-04-05 12:00 | 03:53:30.79 | +68:39:46.2 | HIP 18067 | 13.63 |
| 2026-04-06 00:00 | 03:53:33.10 | +68:39:37.9 | HIP 18067 | 13.70 |
| 2026-04-06 12:00 | 03:53:35.43 | +68:39:29.7 | HIP 18067 | 13.76 |
| 2026-04-07 00:00 | 03:53:37.78 | +68:39:21.6 | HIP 18067 | 13.84 |
| 2026-04-07 12:00 | 03:53:40.15 | +68:39:13.6 | HIP 18067 | 13.92 |
| 2026-04-08 00:00 | 03:53:42.54 | +68:39:05.6 | HIP 18067 | 14.01 |
| 2026-04-08 12:00 | 03:53:44.94 | +68:38:57.8 | HIP 18067 | 14.11 |
| 2026-04-09 00:00 | 03:53:47.37 | +68:38:50.1 | HIP 18067 | 14.21 |
| 2026-04-09 12:00 | 03:53:49.81 | +68:38:42.5 | HIP 18067 | 14.31 |
| 2026-04-10 00:00 | 03:53:52.28 | +68:38:35.0 | HIP 18067 | 14.43 |
| 2026-04-10 12:00 | 03:53:54.76 | +68:38:27.6 | HIP 18067 | 14.55 |
| 2026-04-11 00:00 | 03:53:57.25 | +68:38:20.3 | HIP 18067 | 14.67 |
| 2026-04-11 12:00 | 03:53:59.77 | +68:38:13.1 | HIP 18067 | 14.81 |
| 2026-04-12 00:00 | 03:54:02.30 | +68:38:06.0 | HIP 18067 | 14.94 |
| 2026-04-12 12:00 | 03:54:04.85 | +68:37:59.0 | HIP 18067 | 15.09 |
| 2026-04-13 00:00 | 03:54:07.42 | +68:37:52.1 | HIP 18067 | 15.23 |
| 2026-04-13 12:00 | 03:54:10.01 | +68:37:45.3 | HIP 18067 | 15.39 |
| 2026-04-14 00:00 | 03:54:12.61 | +68:37:38.6 | HIP 18067 | 15.54 |
| 2026-04-14 12:00 | 03:54:15.23 | +68:37:32.0 | HIP 18067 | 15.71 |
| 2026-04-15 00:00 | 03:54:17.86 | +68:37:25.6 | HIP 18067 | 15.88 |
| 2026-04-15 12:00 | 03:54:20.51 | +68:37:19.2 | HIP 18067 | 16.05 |
| 2026-04-16 00:00 | 03:54:23.18 | +68:37:13.0 | HIP 18067 | 16.23 |