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 |
0.997 |
| gb |
-0.963 |
| k |
1.000 |
| δ90 |
9.952 |
| 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) |
| 2026-07-29 00:00 |
10:28:47.73 |
-45:41:08.5 |
HIP 51331 |
19.42 |
| 2026-07-29 12:00 |
10:28:49.71 |
-45:41:03.2 |
HIP 51331 |
19.28 |
| 2026-07-30 00:00 |
10:28:51.69 |
-45:40:58.1 |
HIP 51331 |
19.14 |
| 2026-07-30 12:00 |
10:28:53.68 |
-45:40:53.1 |
HIP 51331 |
19.02 |
| 2026-07-31 00:00 |
10:28:55.68 |
-45:40:48.3 |
HIP 51331 |
18.90 |
| 2026-07-31 12:00 |
10:28:57.68 |
-45:40:43.6 |
HIP 51331 |
18.79 |
| 2026-08-01 00:00 |
10:28:59.70 |
-45:40:39.1 |
HIP 51331 |
18.69 |
| 2026-08-01 12:00 |
10:29:01.72 |
-45:40:34.8 |
HIP 51331 |
18.60 |
| 2026-08-02 00:00 |
10:29:03.75 |
-45:40:30.7 |
HIP 51331 |
18.52 |
| 2026-08-02 12:00 |
10:29:05.79 |
-45:40:26.7 |
HIP 51331 |
18.45 |
| 2026-08-03 00:00 |
10:29:07.83 |
-45:40:22.9 |
HIP 51331 |
18.39 |
| 2026-08-03 12:00 |
10:29:09.88 |
-45:40:19.2 |
HIP 51331 |
18.34 |
| 2026-08-04 00:00 |
10:29:11.94 |
-45:40:15.7 |
HIP 51331 |
18.30 |
| 2026-08-04 12:00 |
10:29:14.01 |
-45:40:12.4 |
HIP 51331 |
18.27 |
| 2026-08-05 00:00 |
10:29:16.08 |
-45:40:09.3 |
HIP 51331 |
18.25 |
| 2026-08-05 12:00 |
10:29:18.16 |
-45:40:06.3 |
HIP 51331 |
18.24 |
| 2026-08-06 00:00 |
10:29:20.25 |
-45:40:03.5 |
HIP 51331 |
18.24 |
| 2026-08-06 12:00 |
10:29:22.34 |
-45:40:00.8 |
HIP 51331 |
18.25 |
| 2026-08-07 00:00 |
10:29:24.44 |
-45:39:58.4 |
HIP 51331 |
18.27 |
| 2026-08-07 12:00 |
10:29:26.54 |
-45:39:56.1 |
HIP 51331 |
18.30 |
| 2026-08-08 00:00 |
10:29:28.66 |
-45:39:53.9 |
HIP 51331 |
18.34 |
| 2026-08-08 12:00 |
10:29:30.77 |
-45:39:51.9 |
HIP 51331 |
18.39 |
| 2026-08-09 00:00 |
10:29:32.90 |
-45:39:50.2 |
HIP 51331 |
18.45 |
| 2026-08-09 12:00 |
10:29:35.03 |
-45:39:48.5 |
HIP 51331 |
18.53 |
| 2026-08-10 00:00 |
10:29:37.16 |
-45:39:47.1 |
HIP 51331 |
18.61 |
| 2026-08-10 12:00 |
10:29:39.31 |
-45:39:45.8 |
HIP 51331 |
18.70 |
| 2026-08-11 00:00 |
10:29:41.45 |
-45:39:44.7 |
HIP 51331 |
18.81 |
| 2026-08-11 12:00 |
10:29:43.60 |
-45:39:43.7 |
HIP 51331 |
18.92 |
| 2026-08-12 00:00 |
10:29:45.76 |
-45:39:43.0 |
HIP 51331 |
19.04 |
| 2026-08-12 12:00 |
10:29:47.92 |
-45:39:42.4 |
HIP 51331 |
19.17 |
| 2026-08-13 00:00 |
10:29:50.09 |
-45:39:41.9 |
HIP 51331 |
19.32 |
| 2026-08-13 12:00 |
10:29:52.26 |
-45:39:41.7 |
HIP 51331 |
19.47 |
| 2026-08-14 00:00 |
10:29:54.43 |
-45:39:41.6 |
HIP 51331 |
19.63 |
| 2026-08-14 12:00 |
10:29:56.61 |
-45:39:41.7 |
HIP 51331 |
19.80 |
| 2026-08-15 00:00 |
10:29:58.80 |
-45:39:41.9 |
HIP 51331 |
19.97 |
| 2026-08-15 12:00 |
10:30:00.99 |
-45:39:42.3 |
HIP 51331 |
20.16 |
| 2026-08-16 00:00 |
10:30:03.18 |
-45:39:42.9 |
HIP 51331 |
20.36 |
| 2026-08-16 12:00 |
10:30:05.37 |
-45:39:43.7 |
HIP 51537 |
20.07 |
| 2026-08-17 00:00 |
10:30:07.57 |
-45:39:44.6 |
HIP 51537 |
19.78 |
| 2026-08-17 12:00 |
10:30:09.78 |
-45:39:45.7 |
HIP 51537 |
19.49 |
| 2026-08-18 00:00 |
10:30:11.98 |
-45:39:47.0 |
HIP 51537 |
19.21 |
| 2026-08-18 12:00 |
10:30:14.19 |
-45:39:48.5 |
HIP 51537 |
18.94 |
| 2026-08-19 00:00 |
10:30:16.40 |
-45:39:50.1 |
HIP 51537 |
18.67 |