メタデータ
| 項目 |
値 |
| Designation |
C/1947 F2 (Becvar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1947-05-03T21:55:11.012160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
23 |
| 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) |
1947-04-14.0000000 |
| e |
1.00000000 |
| q (au) |
0.961893 |
| a (au) |
- |
| i (deg) |
129.171903 |
| Ω (om, deg) |
323.060604 |
| ω (w, deg) |
182.120598 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (10.618 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.618 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
22:12:24.44 |
-18:31:14.5 |
HIP 109634 |
29.68 |
| 2026-09-20 12:00 |
22:12:23.40 |
-18:31:18.8 |
HIP 109634 |
29.77 |
| 2026-09-21 00:00 |
22:12:22.37 |
-18:31:23.1 |
HIP 109634 |
29.86 |
| 2026-09-21 12:00 |
22:12:21.34 |
-18:31:27.4 |
HIP 109634 |
29.96 |
| 2026-09-22 00:00 |
22:12:20.31 |
-18:31:31.6 |
HIP 109634 |
30.05 |
| 2026-09-22 12:00 |
22:12:19.29 |
-18:31:35.8 |
HIP 109634 |
30.14 |
| 2026-09-23 00:00 |
22:12:18.28 |
-18:31:39.9 |
HIP 109634 |
30.24 |
| 2026-09-23 12:00 |
22:12:17.27 |
-18:31:44.0 |
HIP 109634 |
30.34 |
| 2026-09-24 00:00 |
22:12:16.26 |
-18:31:48.0 |
HIP 109634 |
30.43 |
| 2026-09-24 12:00 |
22:12:15.26 |
-18:31:52.0 |
HIP 109634 |
30.53 |
| 2026-09-25 00:00 |
22:12:14.27 |
-18:31:56.0 |
HIP 109634 |
30.63 |
| 2026-09-25 12:00 |
22:12:13.27 |
-18:31:59.9 |
HIP 109634 |
30.73 |
| 2026-09-26 00:00 |
22:12:12.29 |
-18:32:03.7 |
HIP 109634 |
30.83 |
| 2026-09-26 12:00 |
22:12:11.31 |
-18:32:07.6 |
HIP 109634 |
30.93 |
| 2026-09-27 00:00 |
22:12:10.33 |
-18:32:11.3 |
HIP 109634 |
31.03 |
| 2026-09-27 12:00 |
22:12:09.37 |
-18:32:15.1 |
HIP 109634 |
31.14 |
| 2026-09-28 00:00 |
22:12:08.40 |
-18:32:18.8 |
HIP 109634 |
31.24 |
| 2026-09-28 12:00 |
22:12:07.44 |
-18:32:22.4 |
HIP 109634 |
31.34 |
| 2026-09-29 00:00 |
22:12:06.49 |
-18:32:26.0 |
HIP 109634 |
31.45 |
| 2026-09-29 12:00 |
22:12:05.54 |
-18:32:29.6 |
HIP 109634 |
31.55 |
| 2026-09-30 00:00 |
22:12:04.60 |
-18:32:33.1 |
HIP 109634 |
31.65 |
| 2026-09-30 12:00 |
22:12:03.67 |
-18:32:36.5 |
HIP 109634 |
31.76 |
| 2026-10-01 00:00 |
22:12:02.74 |
-18:32:39.9 |
HIP 109634 |
31.86 |
| 2026-10-01 12:00 |
22:12:01.81 |
-18:32:43.3 |
HIP 109634 |
31.97 |
| 2026-10-02 00:00 |
22:12:00.90 |
-18:32:46.6 |
HIP 109634 |
32.07 |
| 2026-10-02 12:00 |
22:11:59.98 |
-18:32:49.9 |
HIP 109634 |
32.18 |
| 2026-10-03 00:00 |
22:11:59.08 |
-18:32:53.1 |
HIP 109634 |
32.28 |
| 2026-10-03 12:00 |
22:11:58.18 |
-18:32:56.2 |
HIP 109634 |
32.39 |
| 2026-10-04 00:00 |
22:11:57.29 |
-18:32:59.4 |
HIP 109634 |
32.49 |
| 2026-10-04 12:00 |
22:11:56.40 |
-18:33:02.4 |
HIP 109634 |
32.60 |
| 2026-10-05 00:00 |
22:11:55.52 |
-18:33:05.5 |
HIP 109634 |
32.70 |
| 2026-10-05 12:00 |
22:11:54.64 |
-18:33:08.4 |
HIP 109634 |
32.81 |
| 2026-10-06 00:00 |
22:11:53.78 |
-18:33:11.4 |
HIP 109634 |
32.91 |
| 2026-10-06 12:00 |
22:11:52.92 |
-18:33:14.2 |
HIP 109634 |
33.02 |
| 2026-10-07 00:00 |
22:11:52.06 |
-18:33:17.0 |
HIP 109634 |
33.12 |
| 2026-10-07 12:00 |
22:11:51.22 |
-18:33:19.8 |
HIP 109634 |
33.22 |
| 2026-10-08 00:00 |
22:11:50.38 |
-18:33:22.5 |
HIP 109634 |
33.33 |
| 2026-10-08 12:00 |
22:11:49.54 |
-18:33:25.2 |
HIP 109634 |
33.43 |
| 2026-10-09 00:00 |
22:11:48.72 |
-18:33:27.8 |
HIP 109634 |
33.53 |
| 2026-10-09 12:00 |
22:11:47.90 |
-18:33:30.4 |
HIP 109634 |
33.64 |
| 2026-10-10 00:00 |
22:11:47.09 |
-18:33:32.9 |
HIP 109634 |
33.74 |
| 2026-10-10 12:00 |
22:11:46.28 |
-18:33:35.4 |
HIP 109634 |
33.84 |
| 2026-10-11 00:00 |
22:11:45.48 |
-18:33:37.8 |
HIP 109634 |
33.94 |