メタデータ
| 項目 |
値 |
| Designation |
213P/Van Ness |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-09-24T09:09:50.725440Z |
| Orbit solution date (soln_date, UTC) |
2025-04-11T15:15:55Z |
| Obs used |
367 |
| NEO |
- |
| M1 |
10.800 |
| K1 |
16.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-02-12.0000000 |
| e |
0.40755795 |
| q (au) |
1.983344 |
| a (au) |
3.347744 |
| i (deg) |
10.377842 |
| Ω (om, deg) |
311.315921 |
| ω (w, deg) |
5.559827 |
| M (ma, deg) |
22.626485 |
等級
散乱 + 全体線形
$$
M_a = (18.184 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.184 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-0.598 |
| 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) |
| 2026-06-01 00:00 |
07:45:53.17 |
+22:24:31.4 |
HIP 37986 |
25.03 |
| 2026-06-01 12:00 |
07:46:17.94 |
+22:23:02.4 |
HIP 37986 |
20.25 |
| 2026-06-02 00:00 |
07:46:42.78 |
+22:21:33.2 |
HIP 37986 |
16.24 |
| 2026-06-02 12:00 |
07:47:07.70 |
+22:20:03.6 |
HIP 37986 |
13.69 |
| 2026-06-03 00:00 |
07:47:32.68 |
+22:18:33.7 |
HIP 37986 |
13.50 |
| 2026-06-03 12:00 |
07:47:57.73 |
+22:17:03.4 |
HIP 37986 |
15.77 |
| 2026-06-04 00:00 |
07:48:22.84 |
+22:15:32.8 |
HIP 37986 |
19.68 |
| 2026-06-04 12:00 |
07:48:48.02 |
+22:14:01.9 |
HIP 38113 |
19.67 |
| 2026-06-05 00:00 |
07:49:13.27 |
+22:12:30.6 |
HIP 38113 |
19.74 |
| 2026-06-05 12:00 |
07:49:38.58 |
+22:10:59.0 |
HIP 38321 |
19.81 |
| 2026-06-06 00:00 |
07:50:03.96 |
+22:09:27.1 |
HIP 38321 |
14.60 |
| 2026-06-06 12:00 |
07:50:29.40 |
+22:07:54.8 |
HIP 38321 |
10.37 |
| 2026-06-07 00:00 |
07:50:54.90 |
+22:06:22.2 |
HIP 38321 |
8.71 |
| 2026-06-07 12:00 |
07:51:20.46 |
+22:04:49.2 |
HIP 38321 |
10.91 |
| 2026-06-08 00:00 |
07:51:46.09 |
+22:03:15.9 |
HIP 38321 |
15.41 |
| 2026-06-08 12:00 |
07:52:11.77 |
+22:01:42.3 |
HIP 38321 |
20.78 |
| 2026-06-09 00:00 |
07:52:37.51 |
+22:00:08.3 |
HIP 38495 |
20.66 |
| 2026-06-09 12:00 |
07:53:03.31 |
+21:58:34.0 |
HIP 38495 |
21.51 |
| 2026-06-10 00:00 |
07:53:29.17 |
+21:56:59.3 |
HIP 38495 |
23.99 |
| 2026-06-10 12:00 |
07:53:55.08 |
+21:55:24.3 |
HIP 38678 |
22.80 |
| 2026-06-11 00:00 |
07:54:21.06 |
+21:53:48.9 |
HIP 38678 |
17.46 |
| 2026-06-11 12:00 |
07:54:47.08 |
+21:52:13.2 |
HIP 38678 |
12.94 |
| 2026-06-12 00:00 |
07:55:13.16 |
+21:50:37.2 |
HIP 38678 |
10.39 |
| 2026-06-12 12:00 |
07:55:39.29 |
+21:49:00.8 |
HIP 38678 |
11.27 |
| 2026-06-13 00:00 |
07:56:05.48 |
+21:47:24.1 |
HIP 38678 |
15.01 |
| 2026-06-13 12:00 |
07:56:31.72 |
+21:45:47.0 |
HIP 38871 |
11.12 |
| 2026-06-14 00:00 |
07:56:58.01 |
+21:44:09.6 |
HIP 38871 |
4.82 |
| 2026-06-14 12:00 |
07:57:24.35 |
+21:42:31.9 |
HIP 38871 |
1.58 |
| 2026-06-15 00:00 |
07:57:50.73 |
+21:40:53.8 |
HIP 38871 |
7.88 |
| 2026-06-15 12:00 |
07:58:17.17 |
+21:39:15.4 |
HIP 38871 |
14.24 |
| 2026-06-16 00:00 |
07:58:43.65 |
+21:37:36.6 |
HIP 38871 |
20.60 |
| 2026-06-16 12:00 |
07:59:10.18 |
+21:35:57.5 |
HIP 39002 |
26.98 |
| 2026-06-17 00:00 |
07:59:36.75 |
+21:34:18.0 |
HIP 39002 |
26.95 |
| 2026-06-17 12:00 |
08:00:03.37 |
+21:32:38.3 |
HIP 39002 |
28.39 |
| 2026-06-18 00:00 |
08:00:30.03 |
+21:30:58.1 |
HIP 39002 |
31.13 |
| 2026-06-18 12:00 |
08:00:56.74 |
+21:29:17.7 |
HIP 39344 |
32.18 |
| 2026-06-19 00:00 |
08:01:23.48 |
+21:27:36.9 |
HIP 39344 |
29.58 |
| 2026-06-19 12:00 |
08:01:50.27 |
+21:25:55.7 |
HIP 39422 |
24.51 |
| 2026-06-20 00:00 |
08:02:17.09 |
+21:24:14.3 |
HIP 39422 |
18.05 |
| 2026-06-20 12:00 |
08:02:43.96 |
+21:22:32.5 |
HIP 39422 |
11.60 |
| 2026-06-21 00:00 |
08:03:10.86 |
+21:20:50.3 |
HIP 39422 |
5.21 |
| 2026-06-21 12:00 |
08:03:37.80 |
+21:19:07.9 |
HIP 39422 |
2.01 |
| 2026-06-22 00:00 |
08:04:04.77 |
+21:17:25.1 |
HIP 39422 |
8.10 |