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) |
| 2026-05-12 00:00 |
17:57:16.03 |
+08:10:54.1 |
HIP 88084 |
32.36 |
| 2026-05-12 12:00 |
17:57:14.79 |
+08:11:01.5 |
HIP 88084 |
32.65 |
| 2026-05-13 00:00 |
17:57:13.55 |
+08:11:08.9 |
HIP 88084 |
32.95 |
| 2026-05-13 12:00 |
17:57:12.30 |
+08:11:16.1 |
HIP 88084 |
33.25 |
| 2026-05-14 00:00 |
17:57:11.04 |
+08:11:23.3 |
HIP 88084 |
33.55 |
| 2026-05-14 12:00 |
17:57:09.78 |
+08:11:30.5 |
HIP 87752 |
33.51 |
| 2026-05-15 00:00 |
17:57:08.50 |
+08:11:37.5 |
HIP 87752 |
33.20 |
| 2026-05-15 12:00 |
17:57:07.22 |
+08:11:44.5 |
HIP 87752 |
32.89 |
| 2026-05-16 00:00 |
17:57:05.93 |
+08:11:51.3 |
HIP 87752 |
32.57 |
| 2026-05-16 12:00 |
17:57:04.63 |
+08:11:58.1 |
HIP 87752 |
32.26 |
| 2026-05-17 00:00 |
17:57:03.33 |
+08:12:04.8 |
HIP 87752 |
31.94 |
| 2026-05-17 12:00 |
17:57:02.01 |
+08:12:11.4 |
HIP 87752 |
31.63 |
| 2026-05-18 00:00 |
17:57:00.69 |
+08:12:17.9 |
HIP 87752 |
31.32 |
| 2026-05-18 12:00 |
17:56:59.36 |
+08:12:24.4 |
HIP 87752 |
31.00 |
| 2026-05-19 00:00 |
17:56:58.03 |
+08:12:30.7 |
HIP 87752 |
30.69 |
| 2026-05-19 12:00 |
17:56:56.69 |
+08:12:37.0 |
HIP 87752 |
30.38 |
| 2026-05-20 00:00 |
17:56:55.34 |
+08:12:43.2 |
HIP 87752 |
30.06 |
| 2026-05-20 12:00 |
17:56:53.98 |
+08:12:49.3 |
HIP 87752 |
29.75 |
| 2026-05-21 00:00 |
17:56:52.62 |
+08:12:55.3 |
HIP 87752 |
29.44 |
| 2026-05-21 12:00 |
17:56:51.25 |
+08:13:01.2 |
HIP 87752 |
29.13 |
| 2026-05-22 00:00 |
17:56:49.88 |
+08:13:07.0 |
HIP 87752 |
28.82 |
| 2026-05-22 12:00 |
17:56:48.50 |
+08:13:12.7 |
HIP 87752 |
28.52 |
| 2026-05-23 00:00 |
17:56:47.11 |
+08:13:18.4 |
HIP 87752 |
28.21 |
| 2026-05-23 12:00 |
17:56:45.71 |
+08:13:23.9 |
HIP 87752 |
27.90 |
| 2026-05-24 00:00 |
17:56:44.31 |
+08:13:29.4 |
HIP 87752 |
27.60 |
| 2026-05-24 12:00 |
17:56:42.91 |
+08:13:34.7 |
HIP 87752 |
27.30 |
| 2026-05-25 00:00 |
17:56:41.50 |
+08:13:40.0 |
HIP 87752 |
27.00 |
| 2026-05-25 12:00 |
17:56:40.08 |
+08:13:45.2 |
HIP 87752 |
26.70 |
| 2026-05-26 00:00 |
17:56:38.66 |
+08:13:50.3 |
HIP 87752 |
26.40 |
| 2026-05-26 12:00 |
17:56:37.23 |
+08:13:55.3 |
HIP 87752 |
26.10 |
| 2026-05-27 00:00 |
17:56:35.79 |
+08:14:00.2 |
HIP 87752 |
25.81 |
| 2026-05-27 12:00 |
17:56:34.35 |
+08:14:05.0 |
HIP 87752 |
25.52 |
| 2026-05-28 00:00 |
17:56:32.91 |
+08:14:09.7 |
HIP 87752 |
25.23 |
| 2026-05-28 12:00 |
17:56:31.46 |
+08:14:14.3 |
HIP 87752 |
24.94 |
| 2026-05-29 00:00 |
17:56:30.00 |
+08:14:18.8 |
HIP 87752 |
24.66 |
| 2026-05-29 12:00 |
17:56:28.54 |
+08:14:23.3 |
HIP 87752 |
24.37 |
| 2026-05-30 00:00 |
17:56:27.08 |
+08:14:27.6 |
HIP 87752 |
24.09 |
| 2026-05-30 12:00 |
17:56:25.61 |
+08:14:31.8 |
HIP 87752 |
23.82 |
| 2026-05-31 00:00 |
17:56:24.14 |
+08:14:36.0 |
HIP 87752 |
23.55 |
| 2026-05-31 12:00 |
17:56:22.66 |
+08:14:40.0 |
HIP 87752 |
23.28 |
| 2026-06-01 00:00 |
17:56:21.17 |
+08:14:44.0 |
HIP 87752 |
23.01 |
| 2026-06-01 12:00 |
17:56:19.69 |
+08:14:47.9 |
HIP 87752 |
22.75 |
| 2026-06-02 00:00 |
17:56:18.19 |
+08:14:51.6 |
HIP 87752 |
22.49 |