メタデータ
| 項目 |
値 |
| Designation |
C/1948 W1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-10-22T20:47:02.400000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
24 |
| 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) |
1948-10-16.0000000 |
| e |
0.99749900 |
| q (au) |
1.273428 |
| a (au) |
509.167533 |
| i (deg) |
87.605400 |
| Ω (om, deg) |
67.668500 |
| ω (w, deg) |
274.209200 |
| M (ma, deg) |
-0.000589 |
等級
散乱 + 全体線形
$$
M_a = (5.916 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.916 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.995 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
18:16:46.84 |
+75:28:53.5 |
HIP 89958 |
17.27 |
| 2026-06-01 12:00 |
18:16:42.50 |
+75:29:00.4 |
HIP 89958 |
17.51 |
| 2026-06-02 00:00 |
18:16:38.14 |
+75:29:07.2 |
HIP 89958 |
17.75 |
| 2026-06-02 12:00 |
18:16:33.77 |
+75:29:13.8 |
HIP 89958 |
17.99 |
| 2026-06-03 00:00 |
18:16:29.38 |
+75:29:20.2 |
HIP 89958 |
18.24 |
| 2026-06-03 12:00 |
18:16:24.98 |
+75:29:26.6 |
HIP 89958 |
18.48 |
| 2026-06-04 00:00 |
18:16:20.55 |
+75:29:32.7 |
HIP 89958 |
18.74 |
| 2026-06-04 12:00 |
18:16:16.12 |
+75:29:38.8 |
HIP 89958 |
18.99 |
| 2026-06-05 00:00 |
18:16:11.67 |
+75:29:44.7 |
HIP 89958 |
19.25 |
| 2026-06-05 12:00 |
18:16:07.20 |
+75:29:50.4 |
HIP 89958 |
19.51 |
| 2026-06-06 00:00 |
18:16:02.73 |
+75:29:56.0 |
HIP 89958 |
19.77 |
| 2026-06-06 12:00 |
18:15:58.23 |
+75:30:01.5 |
HIP 89958 |
20.03 |
| 2026-06-07 00:00 |
18:15:53.73 |
+75:30:06.8 |
HIP 89958 |
20.29 |
| 2026-06-07 12:00 |
18:15:49.21 |
+75:30:12.0 |
HIP 89958 |
20.56 |
| 2026-06-08 00:00 |
18:15:44.68 |
+75:30:17.0 |
HIP 89958 |
20.83 |
| 2026-06-08 12:00 |
18:15:40.13 |
+75:30:21.9 |
HIP 89958 |
21.10 |
| 2026-06-09 00:00 |
18:15:35.58 |
+75:30:26.6 |
HIP 89958 |
21.37 |
| 2026-06-09 12:00 |
18:15:31.01 |
+75:30:31.2 |
HIP 89958 |
21.65 |
| 2026-06-10 00:00 |
18:15:26.43 |
+75:30:35.6 |
HIP 89958 |
21.92 |
| 2026-06-10 12:00 |
18:15:21.84 |
+75:30:39.9 |
HIP 89958 |
22.20 |
| 2026-06-11 00:00 |
18:15:17.24 |
+75:30:44.1 |
HIP 89958 |
22.48 |
| 2026-06-11 12:00 |
18:15:12.63 |
+75:30:48.0 |
HIP 89228 |
22.65 |
| 2026-06-12 00:00 |
18:15:08.01 |
+75:30:51.9 |
HIP 89228 |
22.57 |
| 2026-06-12 12:00 |
18:15:03.37 |
+75:30:55.6 |
HIP 89228 |
22.50 |
| 2026-06-13 00:00 |
18:14:58.73 |
+75:30:59.1 |
HIP 89228 |
22.43 |
| 2026-06-13 12:00 |
18:14:54.09 |
+75:31:02.5 |
HIP 89228 |
22.36 |
| 2026-06-14 00:00 |
18:14:49.43 |
+75:31:05.7 |
HIP 89228 |
22.29 |
| 2026-06-14 12:00 |
18:14:44.76 |
+75:31:08.8 |
HIP 89228 |
22.22 |
| 2026-06-15 00:00 |
18:14:40.09 |
+75:31:11.7 |
HIP 89228 |
22.16 |
| 2026-06-15 12:00 |
18:14:35.41 |
+75:31:14.5 |
HIP 89228 |
22.09 |
| 2026-06-16 00:00 |
18:14:30.72 |
+75:31:17.1 |
HIP 89228 |
22.03 |
| 2026-06-16 12:00 |
18:14:26.03 |
+75:31:19.6 |
HIP 89228 |
21.97 |
| 2026-06-17 00:00 |
18:14:21.33 |
+75:31:21.9 |
HIP 89228 |
21.91 |
| 2026-06-17 12:00 |
18:14:16.62 |
+75:31:24.1 |
HIP 89228 |
21.85 |
| 2026-06-18 00:00 |
18:14:11.91 |
+75:31:26.1 |
HIP 89228 |
21.79 |
| 2026-06-18 12:00 |
18:14:07.20 |
+75:31:27.9 |
HIP 89228 |
21.73 |
| 2026-06-19 00:00 |
18:14:02.48 |
+75:31:29.6 |
HIP 89228 |
21.68 |
| 2026-06-19 12:00 |
18:13:57.76 |
+75:31:31.2 |
HIP 89228 |
21.63 |
| 2026-06-20 00:00 |
18:13:53.03 |
+75:31:32.6 |
HIP 89228 |
21.57 |
| 2026-06-20 12:00 |
18:13:48.30 |
+75:31:33.8 |
HIP 89228 |
21.52 |
| 2026-06-21 00:00 |
18:13:43.56 |
+75:31:34.9 |
HIP 89228 |
21.48 |
| 2026-06-21 12:00 |
18:13:38.83 |
+75:31:35.8 |
HIP 89228 |
21.43 |
| 2026-06-22 00:00 |
18:13:34.09 |
+75:31:36.6 |
HIP 89228 |
21.38 |