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) |
| 2026-03-26 00:00 |
18:57:39.40 |
-43:25:26.4 |
HIP 92973 |
13.72 |
| 2026-03-26 12:00 |
18:57:39.74 |
-43:25:33.5 |
HIP 92973 |
13.82 |
| 2026-03-27 00:00 |
18:57:40.06 |
-43:25:40.6 |
HIP 92973 |
13.91 |
| 2026-03-27 12:00 |
18:57:40.36 |
-43:25:47.8 |
HIP 92973 |
14.01 |
| 2026-03-28 00:00 |
18:57:40.65 |
-43:25:55.0 |
HIP 92973 |
14.10 |
| 2026-03-28 12:00 |
18:57:40.92 |
-43:26:02.2 |
HIP 92973 |
14.18 |
| 2026-03-29 00:00 |
18:57:41.17 |
-43:26:09.5 |
HIP 92973 |
14.27 |
| 2026-03-29 12:00 |
18:57:41.41 |
-43:26:16.7 |
HIP 92973 |
14.35 |
| 2026-03-30 00:00 |
18:57:41.63 |
-43:26:24.0 |
HIP 92973 |
14.43 |
| 2026-03-30 12:00 |
18:57:41.83 |
-43:26:31.4 |
HIP 92973 |
14.51 |
| 2026-03-31 00:00 |
18:57:42.01 |
-43:26:38.7 |
HIP 92973 |
14.59 |
| 2026-03-31 12:00 |
18:57:42.18 |
-43:26:46.1 |
HIP 92973 |
14.67 |
| 2026-04-01 00:00 |
18:57:42.33 |
-43:26:53.4 |
HIP 92973 |
14.74 |
| 2026-04-01 12:00 |
18:57:42.47 |
-43:27:00.8 |
HIP 92973 |
14.81 |
| 2026-04-02 00:00 |
18:57:42.59 |
-43:27:08.3 |
HIP 92973 |
14.88 |
| 2026-04-02 12:00 |
18:57:42.69 |
-43:27:15.7 |
HIP 92973 |
14.95 |
| 2026-04-03 00:00 |
18:57:42.77 |
-43:27:23.2 |
HIP 92973 |
15.02 |
| 2026-04-03 12:00 |
18:57:42.84 |
-43:27:30.7 |
HIP 92973 |
15.08 |
| 2026-04-04 00:00 |
18:57:42.89 |
-43:27:38.2 |
HIP 92973 |
15.14 |
| 2026-04-04 12:00 |
18:57:42.92 |
-43:27:45.7 |
HIP 92973 |
15.20 |
| 2026-04-05 00:00 |
18:57:42.94 |
-43:27:53.2 |
HIP 92973 |
15.26 |
| 2026-04-05 12:00 |
18:57:42.93 |
-43:28:00.8 |
HIP 92973 |
15.32 |
| 2026-04-06 00:00 |
18:57:42.92 |
-43:28:08.4 |
HIP 92973 |
15.37 |
| 2026-04-06 12:00 |
18:57:42.88 |
-43:28:16.0 |
HIP 92973 |
15.43 |
| 2026-04-07 00:00 |
18:57:42.83 |
-43:28:23.6 |
HIP 92973 |
15.48 |
| 2026-04-07 12:00 |
18:57:42.76 |
-43:28:31.2 |
HIP 92973 |
15.53 |
| 2026-04-08 00:00 |
18:57:42.67 |
-43:28:38.8 |
HIP 92973 |
15.57 |
| 2026-04-08 12:00 |
18:57:42.57 |
-43:28:46.4 |
HIP 92973 |
15.62 |
| 2026-04-09 00:00 |
18:57:42.45 |
-43:28:54.1 |
HIP 92973 |
15.67 |
| 2026-04-09 12:00 |
18:57:42.31 |
-43:29:01.8 |
HIP 92973 |
15.71 |
| 2026-04-10 00:00 |
18:57:42.16 |
-43:29:09.5 |
HIP 92973 |
15.75 |
| 2026-04-10 12:00 |
18:57:41.99 |
-43:29:17.2 |
HIP 92973 |
15.79 |
| 2026-04-11 00:00 |
18:57:41.80 |
-43:29:24.9 |
HIP 92973 |
15.83 |
| 2026-04-11 12:00 |
18:57:41.60 |
-43:29:32.6 |
HIP 92973 |
15.87 |
| 2026-04-12 00:00 |
18:57:41.37 |
-43:29:40.3 |
HIP 92973 |
15.90 |
| 2026-04-12 12:00 |
18:57:41.13 |
-43:29:48.0 |
HIP 92973 |
15.93 |
| 2026-04-13 00:00 |
18:57:40.88 |
-43:29:55.8 |
HIP 92973 |
15.97 |
| 2026-04-13 12:00 |
18:57:40.61 |
-43:30:03.5 |
HIP 92973 |
16.00 |
| 2026-04-14 00:00 |
18:57:40.32 |
-43:30:11.3 |
HIP 92973 |
16.03 |
| 2026-04-14 12:00 |
18:57:40.01 |
-43:30:19.1 |
HIP 92973 |
16.06 |
| 2026-04-15 00:00 |
18:57:39.69 |
-43:30:26.8 |
HIP 92973 |
16.08 |
| 2026-04-15 12:00 |
18:57:39.35 |
-43:30:34.6 |
HIP 92973 |
16.11 |
| 2026-04-16 00:00 |
18:57:38.99 |
-43:30:42.4 |
HIP 92973 |
16.14 |