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 |
0.999 |
| 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) |
| 2026-03-26 00:00 |
18:22:09.31 |
+74:57:51.4 |
HIP 89958 |
35.24 |
| 2026-03-26 12:00 |
18:22:09.33 |
+74:58:09.1 |
HIP 89958 |
34.95 |
| 2026-03-27 00:00 |
18:22:09.31 |
+74:58:26.7 |
HIP 89958 |
34.65 |
| 2026-03-27 12:00 |
18:22:09.25 |
+74:58:44.3 |
HIP 89958 |
34.36 |
| 2026-03-28 00:00 |
18:22:09.15 |
+74:59:01.8 |
HIP 89958 |
34.07 |
| 2026-03-28 12:00 |
18:22:09.01 |
+74:59:19.4 |
HIP 89958 |
33.78 |
| 2026-03-29 00:00 |
18:22:08.83 |
+74:59:37.0 |
HIP 89958 |
33.48 |
| 2026-03-29 12:00 |
18:22:08.61 |
+74:59:54.6 |
HIP 89958 |
33.19 |
| 2026-03-30 00:00 |
18:22:08.35 |
+75:00:12.1 |
HIP 89958 |
32.90 |
| 2026-03-30 12:00 |
18:22:08.05 |
+75:00:29.7 |
HIP 89958 |
32.61 |
| 2026-03-31 00:00 |
18:22:07.71 |
+75:00:47.2 |
HIP 89958 |
32.31 |
| 2026-03-31 12:00 |
18:22:07.33 |
+75:01:04.8 |
HIP 89958 |
32.02 |
| 2026-04-01 00:00 |
18:22:06.92 |
+75:01:22.3 |
HIP 89958 |
31.73 |
| 2026-04-01 12:00 |
18:22:06.46 |
+75:01:39.8 |
HIP 89958 |
31.43 |
| 2026-04-02 00:00 |
18:22:05.96 |
+75:01:57.3 |
HIP 89958 |
31.14 |
| 2026-04-02 12:00 |
18:22:05.42 |
+75:02:14.7 |
HIP 89958 |
30.85 |
| 2026-04-03 00:00 |
18:22:04.84 |
+75:02:32.2 |
HIP 89958 |
30.55 |
| 2026-04-03 12:00 |
18:22:04.22 |
+75:02:49.6 |
HIP 89958 |
30.26 |
| 2026-04-04 00:00 |
18:22:03.56 |
+75:03:07.0 |
HIP 89958 |
29.97 |
| 2026-04-04 12:00 |
18:22:02.87 |
+75:03:24.4 |
HIP 89958 |
29.68 |
| 2026-04-05 00:00 |
18:22:02.13 |
+75:03:41.7 |
HIP 89958 |
29.38 |
| 2026-04-05 12:00 |
18:22:01.35 |
+75:03:59.0 |
HIP 89958 |
29.09 |
| 2026-04-06 00:00 |
18:22:00.54 |
+75:04:16.3 |
HIP 89958 |
28.80 |
| 2026-04-06 12:00 |
18:21:59.68 |
+75:04:33.6 |
HIP 89958 |
28.51 |
| 2026-04-07 00:00 |
18:21:58.78 |
+75:04:50.8 |
HIP 89958 |
28.22 |
| 2026-04-07 12:00 |
18:21:57.85 |
+75:05:08.1 |
HIP 89958 |
27.92 |
| 2026-04-08 00:00 |
18:21:56.87 |
+75:05:25.2 |
HIP 89958 |
27.63 |
| 2026-04-08 12:00 |
18:21:55.86 |
+75:05:42.4 |
HIP 89958 |
27.34 |
| 2026-04-09 00:00 |
18:21:54.80 |
+75:05:59.5 |
HIP 89958 |
27.05 |
| 2026-04-09 12:00 |
18:21:53.71 |
+75:06:16.6 |
HIP 89958 |
26.76 |
| 2026-04-10 00:00 |
18:21:52.58 |
+75:06:33.6 |
HIP 89958 |
26.47 |
| 2026-04-10 12:00 |
18:21:51.40 |
+75:06:50.6 |
HIP 89958 |
26.19 |
| 2026-04-11 00:00 |
18:21:50.19 |
+75:07:07.6 |
HIP 89958 |
25.90 |
| 2026-04-11 12:00 |
18:21:48.94 |
+75:07:24.5 |
HIP 89958 |
25.61 |
| 2026-04-12 00:00 |
18:21:47.65 |
+75:07:41.4 |
HIP 89958 |
25.32 |
| 2026-04-12 12:00 |
18:21:46.32 |
+75:07:58.2 |
HIP 89958 |
25.04 |
| 2026-04-13 00:00 |
18:21:44.95 |
+75:08:15.0 |
HIP 89958 |
24.75 |
| 2026-04-13 12:00 |
18:21:43.55 |
+75:08:31.7 |
HIP 89958 |
24.47 |
| 2026-04-14 00:00 |
18:21:42.10 |
+75:08:48.4 |
HIP 89958 |
24.18 |
| 2026-04-14 12:00 |
18:21:40.61 |
+75:09:05.1 |
HIP 89958 |
23.90 |
| 2026-04-15 00:00 |
18:21:39.09 |
+75:09:21.6 |
HIP 89958 |
23.62 |
| 2026-04-15 12:00 |
18:21:37.53 |
+75:09:38.2 |
HIP 89958 |
23.33 |
| 2026-04-16 00:00 |
18:21:35.92 |
+75:09:54.7 |
HIP 89958 |
23.05 |