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 | -2.0876 | -0.253 |
| 1957-05-20 | 1957-05-30 | -11.1259 | +0.300 |
| 1957-05-30 | 1957-12-03 | +5.1118 | -1.106 |
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 | 03:51:58.43 | +69:05:44.5 | HIP 18012 | 5.19 |
| 2026-02-03 12:00 | 03:51:57.42 | +69:05:29.8 | HIP 18012 | 5.12 |
| 2026-02-04 00:00 | 03:51:56.45 | +69:05:15.1 | HIP 18012 | 5.08 |
| 2026-02-04 12:00 | 03:51:55.51 | +69:05:00.5 | HIP 18012 | 5.05 |
| 2026-02-05 00:00 | 03:51:54.59 | +69:04:45.8 | HIP 18012 | 5.03 |
| 2026-02-05 12:00 | 03:51:53.71 | +69:04:31.1 | HIP 18012 | 5.03 |
| 2026-02-06 00:00 | 03:51:52.85 | +69:04:16.4 | HIP 18012 | 5.04 |
| 2026-02-06 12:00 | 03:51:52.03 | +69:04:01.7 | HIP 18012 | 5.08 |
| 2026-02-07 00:00 | 03:51:51.23 | +69:03:47.0 | HIP 18012 | 5.12 |
| 2026-02-07 12:00 | 03:51:50.47 | +69:03:32.2 | HIP 18012 | 5.18 |
| 2026-02-08 00:00 | 03:51:49.73 | +69:03:17.5 | HIP 18012 | 5.26 |
| 2026-02-08 12:00 | 03:51:49.03 | +69:03:02.8 | HIP 18012 | 5.34 |
| 2026-02-09 00:00 | 03:51:48.35 | +69:02:48.1 | HIP 18012 | 5.44 |
| 2026-02-09 12:00 | 03:51:47.71 | +69:02:33.4 | HIP 18012 | 5.55 |
| 2026-02-10 00:00 | 03:51:47.09 | +69:02:18.7 | HIP 18012 | 5.68 |
| 2026-02-10 12:00 | 03:51:46.51 | +69:02:04.0 | HIP 18012 | 5.81 |
| 2026-02-11 00:00 | 03:51:45.95 | +69:01:49.3 | HIP 18012 | 5.95 |
| 2026-02-11 12:00 | 03:51:45.43 | +69:01:34.6 | HIP 18012 | 6.10 |
| 2026-02-12 00:00 | 03:51:44.93 | +69:01:19.9 | HIP 18012 | 6.26 |
| 2026-02-12 12:00 | 03:51:44.47 | +69:01:05.2 | HIP 18012 | 6.43 |
| 2026-02-13 00:00 | 03:51:44.04 | +69:00:50.5 | HIP 18012 | 6.60 |
| 2026-02-13 12:00 | 03:51:43.63 | +69:00:35.9 | HIP 18012 | 6.78 |
| 2026-02-14 00:00 | 03:51:43.26 | +69:00:21.2 | HIP 18012 | 6.96 |
| 2026-02-14 12:00 | 03:51:42.92 | +69:00:06.6 | HIP 18012 | 7.15 |
| 2026-02-15 00:00 | 03:51:42.60 | +68:59:52.0 | HIP 18012 | 7.34 |
| 2026-02-15 12:00 | 03:51:42.32 | +68:59:37.4 | HIP 18012 | 7.54 |
| 2026-02-16 00:00 | 03:51:42.07 | +68:59:22.8 | HIP 18012 | 7.74 |
| 2026-02-16 12:00 | 03:51:41.85 | +68:59:08.2 | HIP 18012 | 7.95 |
| 2026-02-17 00:00 | 03:51:41.66 | +68:58:53.7 | HIP 18012 | 8.15 |
| 2026-02-17 12:00 | 03:51:41.49 | +68:58:39.2 | HIP 18012 | 8.36 |
| 2026-02-18 00:00 | 03:51:41.36 | +68:58:24.7 | HIP 18012 | 8.58 |
| 2026-02-18 12:00 | 03:51:41.26 | +68:58:10.2 | HIP 18012 | 8.79 |
| 2026-02-19 00:00 | 03:51:41.19 | +68:57:55.7 | HIP 18012 | 9.01 |
| 2026-02-19 12:00 | 03:51:41.15 | +68:57:41.3 | HIP 18012 | 9.23 |
| 2026-02-20 00:00 | 03:51:41.14 | +68:57:26.9 | HIP 18012 | 9.45 |
| 2026-02-20 12:00 | 03:51:41.16 | +68:57:12.5 | HIP 18012 | 9.67 |
| 2026-02-21 00:00 | 03:51:41.21 | +68:56:58.2 | HIP 18012 | 9.90 |
| 2026-02-21 12:00 | 03:51:41.29 | +68:56:43.8 | HIP 18012 | 10.12 |
| 2026-02-22 00:00 | 03:51:41.40 | +68:56:29.6 | HIP 18012 | 10.35 |
| 2026-02-22 12:00 | 03:51:41.54 | +68:56:15.3 | HIP 18012 | 10.57 |
| 2026-02-23 00:00 | 03:51:41.71 | +68:56:01.1 | HIP 18012 | 10.80 |
| 2026-02-23 12:00 | 03:51:41.91 | +68:55:46.9 | HIP 18012 | 11.03 |
| 2026-02-24 00:00 | 03:51:42.14 | +68:55:32.7 | HIP 18012 | 11.26 |