メタデータ
| 項目 |
値 |
| Designation |
C/1974 V2 (Bennett) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1974-12-01T12:33:48.922560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
14 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1974-11-19.0000000 |
| e |
0.99991026 |
| q (au) |
0.864648 |
| a (au) |
9635.426690 |
| i (deg) |
134.827008 |
| Ω (om, deg) |
51.348253 |
| ω (w, deg) |
324.967581 |
| M (ma, deg) |
359.999987 |
等級
散乱 + 全体線形
$$
M_a = (9.862 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.862 |
| n |
2.000 |
| gf |
0.800 |
| 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 |
17:52:15.83 |
+07:52:38.1 |
HIP 87525 |
12.92 |
| 2026-09-20 12:00 |
17:52:15.80 |
+07:52:26.0 |
HIP 87525 |
12.79 |
| 2026-09-21 00:00 |
17:52:15.79 |
+07:52:13.9 |
HIP 87525 |
12.66 |
| 2026-09-21 12:00 |
17:52:15.79 |
+07:52:01.7 |
HIP 87525 |
12.53 |
| 2026-09-22 00:00 |
17:52:15.80 |
+07:51:49.6 |
HIP 87525 |
12.40 |
| 2026-09-22 12:00 |
17:52:15.82 |
+07:51:37.5 |
HIP 87525 |
12.27 |
| 2026-09-23 00:00 |
17:52:15.86 |
+07:51:25.4 |
HIP 87525 |
12.14 |
| 2026-09-23 12:00 |
17:52:15.91 |
+07:51:13.3 |
HIP 87525 |
12.01 |
| 2026-09-24 00:00 |
17:52:15.97 |
+07:51:01.2 |
HIP 87525 |
11.88 |
| 2026-09-24 12:00 |
17:52:16.05 |
+07:50:49.1 |
HIP 87525 |
11.74 |
| 2026-09-25 00:00 |
17:52:16.14 |
+07:50:37.0 |
HIP 87525 |
11.61 |
| 2026-09-25 12:00 |
17:52:16.24 |
+07:50:24.9 |
HIP 87525 |
11.48 |
| 2026-09-26 00:00 |
17:52:16.36 |
+07:50:12.8 |
HIP 87525 |
11.34 |
| 2026-09-26 12:00 |
17:52:16.49 |
+07:50:00.7 |
HIP 87525 |
11.20 |
| 2026-09-27 00:00 |
17:52:16.63 |
+07:49:48.6 |
HIP 87525 |
11.07 |
| 2026-09-27 12:00 |
17:52:16.79 |
+07:49:36.6 |
HIP 87525 |
10.93 |
| 2026-09-28 00:00 |
17:52:16.95 |
+07:49:24.5 |
HIP 87525 |
10.79 |
| 2026-09-28 12:00 |
17:52:17.14 |
+07:49:12.5 |
HIP 87525 |
10.66 |
| 2026-09-29 00:00 |
17:52:17.33 |
+07:49:00.5 |
HIP 87525 |
10.52 |
| 2026-09-29 12:00 |
17:52:17.54 |
+07:48:48.5 |
HIP 87525 |
10.38 |
| 2026-09-30 00:00 |
17:52:17.76 |
+07:48:36.5 |
HIP 87525 |
10.24 |
| 2026-09-30 12:00 |
17:52:17.99 |
+07:48:24.5 |
HIP 87525 |
10.10 |
| 2026-10-01 00:00 |
17:52:18.24 |
+07:48:12.5 |
HIP 87525 |
9.96 |
| 2026-10-01 12:00 |
17:52:18.50 |
+07:48:00.6 |
HIP 87525 |
9.82 |
| 2026-10-02 00:00 |
17:52:18.77 |
+07:47:48.6 |
HIP 87525 |
9.68 |
| 2026-10-02 12:00 |
17:52:19.06 |
+07:47:36.7 |
HIP 87525 |
9.53 |
| 2026-10-03 00:00 |
17:52:19.35 |
+07:47:24.8 |
HIP 87525 |
9.39 |
| 2026-10-03 12:00 |
17:52:19.67 |
+07:47:13.0 |
HIP 87525 |
9.25 |
| 2026-10-04 00:00 |
17:52:19.99 |
+07:47:01.1 |
HIP 87525 |
9.11 |
| 2026-10-04 12:00 |
17:52:20.33 |
+07:46:49.3 |
HIP 87525 |
8.97 |
| 2026-10-05 00:00 |
17:52:20.68 |
+07:46:37.5 |
HIP 87525 |
8.82 |
| 2026-10-05 12:00 |
17:52:21.04 |
+07:46:25.7 |
HIP 87525 |
8.68 |
| 2026-10-06 00:00 |
17:52:21.42 |
+07:46:13.9 |
HIP 87525 |
8.54 |
| 2026-10-06 12:00 |
17:52:21.80 |
+07:46:02.2 |
HIP 87525 |
8.40 |
| 2026-10-07 00:00 |
17:52:22.21 |
+07:45:50.4 |
HIP 87525 |
8.26 |
| 2026-10-07 12:00 |
17:52:22.62 |
+07:45:38.8 |
HIP 87525 |
8.11 |
| 2026-10-08 00:00 |
17:52:23.05 |
+07:45:27.1 |
HIP 87525 |
7.97 |
| 2026-10-08 12:00 |
17:52:23.49 |
+07:45:15.5 |
HIP 87525 |
7.83 |
| 2026-10-09 00:00 |
17:52:23.94 |
+07:45:03.9 |
HIP 87525 |
7.69 |
| 2026-10-09 12:00 |
17:52:24.40 |
+07:44:52.3 |
HIP 87525 |
7.56 |
| 2026-10-10 00:00 |
17:52:24.88 |
+07:44:40.7 |
HIP 87525 |
7.42 |
| 2026-10-10 12:00 |
17:52:25.37 |
+07:44:29.2 |
HIP 87525 |
7.28 |
| 2026-10-11 00:00 |
17:52:25.87 |
+07:44:17.8 |
HIP 87525 |
7.15 |