C/1989 W1 (Aarseth-Brewington)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1989 W1 (Aarseth-Brewington) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1989-12-27T21:19:34.193280Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:38Z |
| Obs used | 73 |
| NEO | - |
| M1 | 8.200 |
| K1 | 13.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1989-12-05.0000000 |
| e | 1.00006499 |
| q (au) | 0.300689 |
| a (au) | -4626.812393 |
| i (deg) | 88.386281 |
| Ω (om, deg) | 345.916879 |
| ω (w, deg) | 205.258893 |
| M (ma, deg) | -0.000072 |
等級
散乱 + 全体線形
$$ M_a = (7.015 + 3.263\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 7.015 |
| n | 3.263 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 10.000 |
| 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 |
|---|---|---|---|
| 1989-09-01 | 1989-11-19 | +12.2046 | -0.330 |
| 1989-11-19 | 1989-12-04 | -0.1288 | -0.034 |
| 1989-12-04 | 1989-12-27 | -1.0628 | -0.451 |
| 1989-12-28 | 1990-01-31 | +0.3042 | +0.326 |
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 | 22:45:11.78 | +10:56:25.6 | HIP 112354 | 15.62 |
| 2026-07-29 12:00 | 22:45:10.26 | +10:56:22.5 | HIP 112354 | 15.77 |
| 2026-07-30 00:00 | 22:45:08.74 | +10:56:19.3 | HIP 112354 | 15.92 |
| 2026-07-30 12:00 | 22:45:07.21 | +10:56:16.0 | HIP 112354 | 16.09 |
| 2026-07-31 00:00 | 22:45:05.67 | +10:56:12.6 | HIP 112354 | 16.27 |
| 2026-07-31 12:00 | 22:45:04.13 | +10:56:09.1 | HIP 112354 | 16.45 |
| 2026-08-01 00:00 | 22:45:02.57 | +10:56:05.4 | HIP 112354 | 16.65 |
| 2026-08-01 12:00 | 22:45:01.01 | +10:56:01.6 | HIP 112354 | 16.85 |
| 2026-08-02 00:00 | 22:44:59.44 | +10:55:57.8 | HIP 112354 | 17.07 |
| 2026-08-02 12:00 | 22:44:57.86 | +10:55:53.8 | HIP 112354 | 17.29 |
| 2026-08-03 00:00 | 22:44:56.27 | +10:55:49.7 | HIP 112354 | 17.52 |
| 2026-08-03 12:00 | 22:44:54.68 | +10:55:45.5 | HIP 112222 | 17.68 |
| 2026-08-04 00:00 | 22:44:53.08 | +10:55:41.1 | HIP 112222 | 17.29 |
| 2026-08-04 12:00 | 22:44:51.47 | +10:55:36.7 | HIP 112222 | 16.90 |
| 2026-08-05 00:00 | 22:44:49.85 | +10:55:32.2 | HIP 112222 | 16.51 |
| 2026-08-05 12:00 | 22:44:48.23 | +10:55:27.5 | HIP 112222 | 16.11 |
| 2026-08-06 00:00 | 22:44:46.60 | +10:55:22.7 | HIP 112222 | 15.72 |
| 2026-08-06 12:00 | 22:44:44.96 | +10:55:17.9 | HIP 112222 | 15.32 |
| 2026-08-07 00:00 | 22:44:43.31 | +10:55:12.9 | HIP 112222 | 14.93 |
| 2026-08-07 12:00 | 22:44:41.66 | +10:55:07.8 | HIP 112222 | 14.53 |
| 2026-08-08 00:00 | 22:44:40.00 | +10:55:02.6 | HIP 112222 | 14.13 |
| 2026-08-08 12:00 | 22:44:38.34 | +10:54:57.2 | HIP 112222 | 13.74 |
| 2026-08-09 00:00 | 22:44:36.67 | +10:54:51.8 | HIP 112222 | 13.34 |
| 2026-08-09 12:00 | 22:44:34.99 | +10:54:46.3 | HIP 112222 | 12.94 |
| 2026-08-10 00:00 | 22:44:33.31 | +10:54:40.6 | HIP 112222 | 12.54 |
| 2026-08-10 12:00 | 22:44:31.62 | +10:54:34.9 | HIP 112222 | 12.15 |
| 2026-08-11 00:00 | 22:44:29.92 | +10:54:29.0 | HIP 112222 | 11.75 |
| 2026-08-11 12:00 | 22:44:28.22 | +10:54:23.1 | HIP 112222 | 11.35 |
| 2026-08-12 00:00 | 22:44:26.51 | +10:54:17.0 | HIP 112222 | 10.96 |
| 2026-08-12 12:00 | 22:44:24.80 | +10:54:10.8 | HIP 112222 | 10.57 |
| 2026-08-13 00:00 | 22:44:23.08 | +10:54:04.5 | HIP 112222 | 10.18 |
| 2026-08-13 12:00 | 22:44:21.36 | +10:53:58.1 | HIP 112222 | 9.79 |
| 2026-08-14 00:00 | 22:44:19.63 | +10:53:51.6 | HIP 112222 | 9.41 |
| 2026-08-14 12:00 | 22:44:17.89 | +10:53:45.0 | HIP 112222 | 9.03 |
| 2026-08-15 00:00 | 22:44:16.15 | +10:53:38.3 | HIP 112222 | 8.66 |
| 2026-08-15 12:00 | 22:44:14.41 | +10:53:31.5 | HIP 112222 | 8.30 |
| 2026-08-16 00:00 | 22:44:12.66 | +10:53:24.6 | HIP 112222 | 7.94 |
| 2026-08-16 12:00 | 22:44:10.91 | +10:53:17.6 | HIP 112222 | 7.59 |
| 2026-08-17 00:00 | 22:44:09.15 | +10:53:10.5 | HIP 112222 | 7.25 |
| 2026-08-17 12:00 | 22:44:07.39 | +10:53:03.3 | HIP 112222 | 6.92 |
| 2026-08-18 00:00 | 22:44:05.63 | +10:52:56.0 | HIP 112222 | 6.61 |
| 2026-08-18 12:00 | 22:44:03.86 | +10:52:48.6 | HIP 112222 | 6.31 |
| 2026-08-19 00:00 | 22:44:02.09 | +10:52:41.1 | HIP 112222 | 6.03 |