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) |
| 2026-03-26 00:00 |
10:28:21.39 |
-46:50:37.5 |
HIP 51176 |
14.64 |
| 2026-03-26 12:00 |
10:28:19.53 |
-46:50:22.8 |
HIP 51176 |
14.24 |
| 2026-03-27 00:00 |
10:28:17.69 |
-46:50:08.1 |
HIP 51176 |
13.84 |
| 2026-03-27 12:00 |
10:28:15.85 |
-46:49:53.2 |
HIP 51176 |
13.44 |
| 2026-03-28 00:00 |
10:28:14.03 |
-46:49:38.2 |
HIP 51176 |
13.04 |
| 2026-03-28 12:00 |
10:28:12.22 |
-46:49:23.0 |
HIP 51176 |
12.65 |
| 2026-03-29 00:00 |
10:28:10.42 |
-46:49:07.8 |
HIP 51176 |
12.25 |
| 2026-03-29 12:00 |
10:28:08.63 |
-46:48:52.4 |
HIP 51176 |
11.85 |
| 2026-03-30 00:00 |
10:28:06.85 |
-46:48:36.8 |
HIP 51176 |
11.46 |
| 2026-03-30 12:00 |
10:28:05.08 |
-46:48:21.2 |
HIP 51176 |
11.06 |
| 2026-03-31 00:00 |
10:28:03.32 |
-46:48:05.4 |
HIP 51176 |
10.67 |
| 2026-03-31 12:00 |
10:28:01.57 |
-46:47:49.5 |
HIP 51176 |
10.27 |
| 2026-04-01 00:00 |
10:27:59.84 |
-46:47:33.5 |
HIP 51176 |
9.88 |
| 2026-04-01 12:00 |
10:27:58.12 |
-46:47:17.4 |
HIP 51176 |
9.49 |
| 2026-04-02 00:00 |
10:27:56.41 |
-46:47:01.1 |
HIP 51176 |
9.10 |
| 2026-04-02 12:00 |
10:27:54.71 |
-46:46:44.8 |
HIP 51176 |
8.72 |
| 2026-04-03 00:00 |
10:27:53.02 |
-46:46:28.3 |
HIP 51176 |
8.33 |
| 2026-04-03 12:00 |
10:27:51.34 |
-46:46:11.7 |
HIP 51176 |
7.95 |
| 2026-04-04 00:00 |
10:27:49.68 |
-46:45:55.0 |
HIP 51176 |
7.57 |
| 2026-04-04 12:00 |
10:27:48.03 |
-46:45:38.1 |
HIP 51176 |
7.19 |
| 2026-04-05 00:00 |
10:27:46.39 |
-46:45:21.2 |
HIP 51176 |
6.81 |
| 2026-04-05 12:00 |
10:27:44.77 |
-46:45:04.2 |
HIP 51176 |
6.44 |
| 2026-04-06 00:00 |
10:27:43.16 |
-46:44:47.0 |
HIP 51176 |
6.08 |
| 2026-04-06 12:00 |
10:27:41.56 |
-46:44:29.8 |
HIP 51176 |
5.72 |
| 2026-04-07 00:00 |
10:27:39.97 |
-46:44:12.4 |
HIP 51176 |
5.37 |
| 2026-04-07 12:00 |
10:27:38.40 |
-46:43:54.9 |
HIP 51176 |
5.02 |
| 2026-04-08 00:00 |
10:27:36.84 |
-46:43:37.4 |
HIP 51176 |
4.69 |
| 2026-04-08 12:00 |
10:27:35.29 |
-46:43:19.7 |
HIP 51176 |
4.37 |
| 2026-04-09 00:00 |
10:27:33.76 |
-46:43:01.9 |
HIP 51176 |
4.06 |
| 2026-04-09 12:00 |
10:27:32.24 |
-46:42:44.0 |
HIP 51176 |
3.77 |
| 2026-04-10 00:00 |
10:27:30.73 |
-46:42:26.1 |
HIP 51176 |
3.51 |
| 2026-04-10 12:00 |
10:27:29.24 |
-46:42:08.0 |
HIP 51176 |
3.27 |
| 2026-04-11 00:00 |
10:27:27.76 |
-46:41:49.9 |
HIP 51176 |
3.07 |
| 2026-04-11 12:00 |
10:27:26.30 |
-46:41:31.6 |
HIP 51176 |
2.91 |
| 2026-04-12 00:00 |
10:27:24.85 |
-46:41:13.3 |
HIP 51176 |
2.80 |
| 2026-04-12 12:00 |
10:27:23.41 |
-46:40:54.8 |
HIP 51176 |
2.75 |
| 2026-04-13 00:00 |
10:27:21.99 |
-46:40:36.3 |
HIP 51176 |
2.76 |
| 2026-04-13 12:00 |
10:27:20.59 |
-46:40:17.7 |
HIP 51176 |
2.82 |
| 2026-04-14 00:00 |
10:27:19.19 |
-46:39:59.0 |
HIP 51176 |
2.94 |
| 2026-04-14 12:00 |
10:27:17.82 |
-46:39:40.2 |
HIP 51176 |
3.11 |
| 2026-04-15 00:00 |
10:27:16.45 |
-46:39:21.3 |
HIP 51176 |
3.32 |
| 2026-04-15 12:00 |
10:27:15.11 |
-46:39:02.4 |
HIP 51176 |
3.56 |
| 2026-04-16 00:00 |
10:27:13.78 |
-46:38:43.4 |
HIP 51176 |
3.82 |