メタデータ
| 項目 |
値 |
| Designation |
C/1946 U1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1947-02-07T08:36:00.273600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
34 |
| 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) |
1947-01-12.0000000 |
| e |
1.00061189 |
| q (au) |
2.407675 |
| a (au) |
-3934.834500 |
| i (deg) |
108.175807 |
| Ω (om, deg) |
35.557431 |
| ω (w, deg) |
348.621875 |
| M (ma, deg) |
-0.000105 |
等級
散乱 + 全体線形
$$
M_a = (1.950 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.950 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.999 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-05-12 00:00 |
15:23:04.18 |
+10:12:15.6 |
HIP 75315 |
13.92 |
| 2026-05-12 12:00 |
15:23:03.01 |
+10:12:19.6 |
HIP 75315 |
13.91 |
| 2026-05-13 00:00 |
15:23:01.85 |
+10:12:23.4 |
HIP 75315 |
13.91 |
| 2026-05-13 12:00 |
15:23:00.69 |
+10:12:27.2 |
HIP 75315 |
13.91 |
| 2026-05-14 00:00 |
15:22:59.53 |
+10:12:31.0 |
HIP 75315 |
13.92 |
| 2026-05-14 12:00 |
15:22:58.36 |
+10:12:34.6 |
HIP 75315 |
13.94 |
| 2026-05-15 00:00 |
15:22:57.20 |
+10:12:38.2 |
HIP 75315 |
13.96 |
| 2026-05-15 12:00 |
15:22:56.04 |
+10:12:41.7 |
HIP 75315 |
14.00 |
| 2026-05-16 00:00 |
15:22:54.87 |
+10:12:45.2 |
HIP 75315 |
14.04 |
| 2026-05-16 12:00 |
15:22:53.71 |
+10:12:48.5 |
HIP 75315 |
14.08 |
| 2026-05-17 00:00 |
15:22:52.55 |
+10:12:51.8 |
HIP 75315 |
14.14 |
| 2026-05-17 12:00 |
15:22:51.39 |
+10:12:55.0 |
HIP 75315 |
14.20 |
| 2026-05-18 00:00 |
15:22:50.23 |
+10:12:58.2 |
HIP 75315 |
14.26 |
| 2026-05-18 12:00 |
15:22:49.07 |
+10:13:01.2 |
HIP 75315 |
14.34 |
| 2026-05-19 00:00 |
15:22:47.91 |
+10:13:04.2 |
HIP 75315 |
14.42 |
| 2026-05-19 12:00 |
15:22:46.75 |
+10:13:07.1 |
HIP 75315 |
14.50 |
| 2026-05-20 00:00 |
15:22:45.59 |
+10:13:10.0 |
HIP 75315 |
14.59 |
| 2026-05-20 12:00 |
15:22:44.44 |
+10:13:12.8 |
HIP 75315 |
14.69 |
| 2026-05-21 00:00 |
15:22:43.28 |
+10:13:15.5 |
HIP 75315 |
14.80 |
| 2026-05-21 12:00 |
15:22:42.13 |
+10:13:18.1 |
HIP 75315 |
14.91 |
| 2026-05-22 00:00 |
15:22:40.97 |
+10:13:20.6 |
HIP 75315 |
15.02 |
| 2026-05-22 12:00 |
15:22:39.82 |
+10:13:23.1 |
HIP 75315 |
15.14 |
| 2026-05-23 00:00 |
15:22:38.67 |
+10:13:25.5 |
HIP 75315 |
15.27 |
| 2026-05-23 12:00 |
15:22:37.52 |
+10:13:27.8 |
HIP 75315 |
15.40 |
| 2026-05-24 00:00 |
15:22:36.38 |
+10:13:30.0 |
HIP 75315 |
15.54 |
| 2026-05-24 12:00 |
15:22:35.23 |
+10:13:32.2 |
HIP 75315 |
15.68 |
| 2026-05-25 00:00 |
15:22:34.09 |
+10:13:34.3 |
HIP 75315 |
15.83 |
| 2026-05-25 12:00 |
15:22:32.95 |
+10:13:36.3 |
HIP 75315 |
15.98 |
| 2026-05-26 00:00 |
15:22:31.81 |
+10:13:38.2 |
HIP 75315 |
16.13 |
| 2026-05-26 12:00 |
15:22:30.67 |
+10:13:40.1 |
HIP 75315 |
16.29 |
| 2026-05-27 00:00 |
15:22:29.54 |
+10:13:41.8 |
HIP 75315 |
16.45 |
| 2026-05-27 12:00 |
15:22:28.40 |
+10:13:43.5 |
HIP 75315 |
16.62 |
| 2026-05-28 00:00 |
15:22:27.27 |
+10:13:45.2 |
HIP 75315 |
16.79 |
| 2026-05-28 12:00 |
15:22:26.14 |
+10:13:46.7 |
HIP 75315 |
16.96 |
| 2026-05-29 00:00 |
15:22:25.02 |
+10:13:48.2 |
HIP 75315 |
17.14 |
| 2026-05-29 12:00 |
15:22:23.89 |
+10:13:49.6 |
HIP 75315 |
17.32 |
| 2026-05-30 00:00 |
15:22:22.77 |
+10:13:50.9 |
HIP 75315 |
17.50 |
| 2026-05-30 12:00 |
15:22:21.66 |
+10:13:52.2 |
HIP 75194 |
17.43 |
| 2026-05-31 00:00 |
15:22:20.54 |
+10:13:53.3 |
HIP 75194 |
17.32 |
| 2026-05-31 12:00 |
15:22:19.43 |
+10:13:54.4 |
HIP 75194 |
17.21 |
| 2026-06-01 00:00 |
15:22:18.32 |
+10:13:55.4 |
HIP 75194 |
17.11 |
| 2026-06-01 12:00 |
15:22:17.21 |
+10:13:56.3 |
HIP 75194 |
17.02 |
| 2026-06-02 00:00 |
15:22:16.11 |
+10:13:57.2 |
HIP 75194 |
16.93 |