メタデータ
| 項目 |
値 |
| Designation |
C/1941 B1 (Friend-Reese-Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1941-01-20T09:04:01.920000Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
29 |
| 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) |
1941-01-20.3778000 |
| e |
0.98122100 |
| q (au) |
0.941864 |
| a (au) |
50.155173 |
| i (deg) |
26.275600 |
| Ω (om, deg) |
329.789700 |
| ω (w, deg) |
132.731900 |
| M (ma, deg) |
0.000000 |
等級
散乱 + 全体線形
$$
M_a = (10.927 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.927 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.906 |
| 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) |
| 2026-05-12 00:00 |
18:56:58.48 |
-43:37:18.4 |
HIP 92880 |
16.66 |
| 2026-05-12 12:00 |
18:56:57.31 |
-43:37:25.5 |
HIP 92880 |
16.43 |
| 2026-05-13 00:00 |
18:56:56.12 |
-43:37:32.7 |
HIP 92880 |
16.19 |
| 2026-05-13 12:00 |
18:56:54.92 |
-43:37:39.8 |
HIP 92880 |
15.94 |
| 2026-05-14 00:00 |
18:56:53.71 |
-43:37:46.9 |
HIP 92880 |
15.70 |
| 2026-05-14 12:00 |
18:56:52.48 |
-43:37:54.0 |
HIP 92880 |
15.45 |
| 2026-05-15 00:00 |
18:56:51.24 |
-43:38:01.0 |
HIP 92880 |
15.21 |
| 2026-05-15 12:00 |
18:56:49.99 |
-43:38:08.0 |
HIP 92880 |
14.96 |
| 2026-05-16 00:00 |
18:56:48.73 |
-43:38:15.0 |
HIP 92880 |
14.70 |
| 2026-05-16 12:00 |
18:56:47.45 |
-43:38:21.9 |
HIP 92880 |
14.45 |
| 2026-05-17 00:00 |
18:56:46.16 |
-43:38:28.8 |
HIP 92880 |
14.19 |
| 2026-05-17 12:00 |
18:56:44.85 |
-43:38:35.7 |
HIP 92880 |
13.94 |
| 2026-05-18 00:00 |
18:56:43.54 |
-43:38:42.5 |
HIP 92880 |
13.68 |
| 2026-05-18 12:00 |
18:56:42.21 |
-43:38:49.4 |
HIP 92880 |
13.42 |
| 2026-05-19 00:00 |
18:56:40.87 |
-43:38:56.1 |
HIP 92880 |
13.15 |
| 2026-05-19 12:00 |
18:56:39.52 |
-43:39:02.9 |
HIP 92880 |
12.89 |
| 2026-05-20 00:00 |
18:56:38.15 |
-43:39:09.6 |
HIP 92880 |
12.62 |
| 2026-05-20 12:00 |
18:56:36.77 |
-43:39:16.3 |
HIP 92880 |
12.35 |
| 2026-05-21 00:00 |
18:56:35.38 |
-43:39:22.9 |
HIP 92880 |
12.08 |
| 2026-05-21 12:00 |
18:56:33.98 |
-43:39:29.5 |
HIP 92880 |
11.81 |
| 2026-05-22 00:00 |
18:56:32.57 |
-43:39:36.0 |
HIP 92880 |
11.54 |
| 2026-05-22 12:00 |
18:56:31.14 |
-43:39:42.6 |
HIP 92880 |
11.26 |
| 2026-05-23 00:00 |
18:56:29.71 |
-43:39:49.1 |
HIP 92880 |
10.99 |
| 2026-05-23 12:00 |
18:56:28.26 |
-43:39:55.5 |
HIP 92880 |
10.71 |
| 2026-05-24 00:00 |
18:56:26.80 |
-43:40:01.9 |
HIP 92880 |
10.43 |
| 2026-05-24 12:00 |
18:56:25.33 |
-43:40:08.3 |
HIP 92880 |
10.14 |
| 2026-05-25 00:00 |
18:56:23.85 |
-43:40:14.6 |
HIP 92880 |
9.86 |
| 2026-05-25 12:00 |
18:56:22.36 |
-43:40:20.9 |
HIP 92880 |
9.58 |
| 2026-05-26 00:00 |
18:56:20.86 |
-43:40:27.1 |
HIP 92880 |
9.29 |
| 2026-05-26 12:00 |
18:56:19.35 |
-43:40:33.3 |
HIP 92880 |
9.00 |
| 2026-05-27 00:00 |
18:56:17.82 |
-43:40:39.5 |
HIP 92880 |
8.71 |
| 2026-05-27 12:00 |
18:56:16.29 |
-43:40:45.6 |
HIP 92880 |
8.42 |
| 2026-05-28 00:00 |
18:56:14.74 |
-43:40:51.7 |
HIP 92880 |
8.13 |
| 2026-05-28 12:00 |
18:56:13.19 |
-43:40:57.7 |
HIP 92880 |
7.84 |
| 2026-05-29 00:00 |
18:56:11.63 |
-43:41:03.7 |
HIP 92880 |
7.54 |
| 2026-05-29 12:00 |
18:56:10.05 |
-43:41:09.7 |
HIP 92880 |
7.25 |
| 2026-05-30 00:00 |
18:56:08.47 |
-43:41:15.6 |
HIP 92880 |
6.95 |
| 2026-05-30 12:00 |
18:56:06.87 |
-43:41:21.4 |
HIP 92880 |
6.65 |
| 2026-05-31 00:00 |
18:56:05.27 |
-43:41:27.2 |
HIP 92880 |
6.35 |
| 2026-05-31 12:00 |
18:56:03.66 |
-43:41:33.0 |
HIP 92880 |
6.05 |
| 2026-06-01 00:00 |
18:56:02.03 |
-43:41:38.7 |
HIP 92880 |
5.75 |
| 2026-06-01 12:00 |
18:56:00.40 |
-43:41:44.4 |
HIP 92880 |
5.45 |
| 2026-06-02 00:00 |
18:55:58.76 |
-43:41:50.0 |
HIP 92880 |
5.15 |