メタデータ
| 項目 |
値 |
| Designation |
C/1974 V1 (van den Bergh) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1974-08-08T03:12:11.047680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
6.000 |
| 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) |
1975-03-15.0000000 |
| e |
1.00366502 |
| q (au) |
6.019170 |
| a (au) |
-1642.329256 |
| i (deg) |
60.856171 |
| Ω (om, deg) |
226.103510 |
| ω (w, deg) |
151.794940 |
| M (ma, deg) |
0.003241 |
等級
散乱 + 全体線形
$$
M_a = (9.663 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.663 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-0.963 |
| k |
1.000 |
| δ90 |
9.933 |
| 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 |
10:26:27.36 |
-46:21:03.2 |
HIP 51176 |
22.68 |
| 2026-05-12 12:00 |
10:26:26.93 |
-46:20:42.2 |
HIP 51176 |
23.03 |
| 2026-05-13 00:00 |
10:26:26.52 |
-46:20:21.2 |
HIP 51176 |
23.39 |
| 2026-05-13 12:00 |
10:26:26.13 |
-46:20:00.2 |
HIP 51176 |
23.74 |
| 2026-05-14 00:00 |
10:26:25.76 |
-46:19:39.2 |
HIP 51176 |
24.09 |
| 2026-05-14 12:00 |
10:26:25.41 |
-46:19:18.2 |
HIP 51176 |
24.44 |
| 2026-05-15 00:00 |
10:26:25.08 |
-46:18:57.2 |
HIP 51176 |
24.80 |
| 2026-05-15 12:00 |
10:26:24.76 |
-46:18:36.3 |
HIP 51176 |
25.14 |
| 2026-05-16 00:00 |
10:26:24.46 |
-46:18:15.3 |
HIP 51176 |
25.49 |
| 2026-05-16 12:00 |
10:26:24.19 |
-46:17:54.3 |
HIP 51176 |
25.84 |
| 2026-05-17 00:00 |
10:26:23.93 |
-46:17:33.4 |
HIP 51176 |
26.19 |
| 2026-05-17 12:00 |
10:26:23.68 |
-46:17:12.5 |
HIP 51176 |
26.53 |
| 2026-05-18 00:00 |
10:26:23.46 |
-46:16:51.6 |
HIP 51276 |
26.84 |
| 2026-05-18 12:00 |
10:26:23.26 |
-46:16:30.8 |
HIP 51276 |
27.09 |
| 2026-05-19 00:00 |
10:26:23.07 |
-46:16:09.9 |
HIP 51276 |
27.33 |
| 2026-05-19 12:00 |
10:26:22.91 |
-46:15:49.1 |
HIP 51276 |
27.58 |
| 2026-05-20 00:00 |
10:26:22.76 |
-46:15:28.3 |
HIP 51276 |
27.82 |
| 2026-05-20 12:00 |
10:26:22.63 |
-46:15:07.5 |
HIP 51276 |
28.07 |
| 2026-05-21 00:00 |
10:26:22.52 |
-46:14:46.8 |
HIP 51276 |
28.31 |
| 2026-05-21 12:00 |
10:26:22.43 |
-46:14:26.1 |
HIP 51276 |
28.56 |
| 2026-05-22 00:00 |
10:26:22.35 |
-46:14:05.4 |
HIP 51276 |
28.80 |
| 2026-05-22 12:00 |
10:26:22.30 |
-46:13:44.8 |
HIP 51276 |
29.04 |
| 2026-05-23 00:00 |
10:26:22.26 |
-46:13:24.2 |
HIP 51276 |
29.28 |
| 2026-05-23 12:00 |
10:26:22.25 |
-46:13:03.6 |
HIP 51276 |
29.52 |
| 2026-05-24 00:00 |
10:26:22.25 |
-46:12:43.1 |
HIP 51276 |
29.76 |
| 2026-05-24 12:00 |
10:26:22.27 |
-46:12:22.6 |
HIP 51276 |
30.00 |
| 2026-05-25 00:00 |
10:26:22.31 |
-46:12:02.1 |
HIP 51276 |
30.24 |
| 2026-05-25 12:00 |
10:26:22.36 |
-46:11:41.7 |
HIP 51276 |
30.48 |
| 2026-05-26 00:00 |
10:26:22.44 |
-46:11:21.4 |
HIP 51276 |
30.72 |
| 2026-05-26 12:00 |
10:26:22.53 |
-46:11:01.1 |
HIP 51276 |
30.95 |
| 2026-05-27 00:00 |
10:26:22.64 |
-46:10:40.8 |
HIP 51276 |
31.19 |
| 2026-05-27 12:00 |
10:26:22.77 |
-46:10:20.6 |
HIP 51276 |
31.42 |
| 2026-05-28 00:00 |
10:26:22.92 |
-46:10:00.4 |
HIP 51276 |
31.66 |
| 2026-05-28 12:00 |
10:26:23.09 |
-46:09:40.3 |
HIP 51276 |
31.89 |
| 2026-05-29 00:00 |
10:26:23.28 |
-46:09:20.2 |
HIP 51276 |
32.12 |
| 2026-05-29 12:00 |
10:26:23.48 |
-46:09:00.2 |
HIP 51276 |
32.35 |
| 2026-05-30 00:00 |
10:26:23.70 |
-46:08:40.3 |
HIP 51276 |
32.58 |
| 2026-05-30 12:00 |
10:26:23.94 |
-46:08:20.4 |
HIP 51276 |
32.81 |
| 2026-05-31 00:00 |
10:26:24.20 |
-46:08:00.5 |
HIP 51276 |
33.04 |
| 2026-05-31 12:00 |
10:26:24.48 |
-46:07:40.7 |
HIP 51276 |
33.27 |
| 2026-06-01 00:00 |
10:26:24.77 |
-46:07:21.0 |
HIP 51276 |
33.49 |
| 2026-06-01 12:00 |
10:26:25.09 |
-46:07:01.3 |
HIP 51078 |
33.35 |
| 2026-06-02 00:00 |
10:26:25.42 |
-46:06:41.7 |
HIP 51078 |
33.03 |