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
$$
M_a = (18.185 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.185 |
| n |
2.000 |
| gf |
1.000 |
| 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) |
| 2026-03-26 00:00 |
07:08:43.92 |
+24:58:37.0 |
HIP 34532 |
18.88 |
| 2026-03-26 12:00 |
07:08:48.85 |
+24:57:45.0 |
HIP 34532 |
19.24 |
| 2026-03-27 00:00 |
07:08:54.01 |
+24:56:52.7 |
HIP 34532 |
19.69 |
| 2026-03-27 12:00 |
07:08:59.41 |
+24:56:00.2 |
HIP 34532 |
20.22 |
| 2026-03-28 00:00 |
07:09:05.03 |
+24:55:07.5 |
HIP 34532 |
20.84 |
| 2026-03-28 12:00 |
07:09:10.89 |
+24:54:14.5 |
HIP 34532 |
21.56 |
| 2026-03-29 00:00 |
07:09:16.97 |
+24:53:21.3 |
HIP 34532 |
22.37 |
| 2026-03-29 12:00 |
07:09:23.28 |
+24:52:27.9 |
HIP 34532 |
23.27 |
| 2026-03-30 00:00 |
07:09:29.82 |
+24:51:34.2 |
HIP 34532 |
24.27 |
| 2026-03-30 12:00 |
07:09:36.58 |
+24:50:40.3 |
HIP 34704 |
24.92 |
| 2026-03-31 00:00 |
07:09:43.56 |
+24:49:46.1 |
HIP 34704 |
23.10 |
| 2026-03-31 12:00 |
07:09:50.76 |
+24:48:51.7 |
HIP 34704 |
21.23 |
| 2026-04-01 00:00 |
07:09:58.18 |
+24:47:57.1 |
HIP 34704 |
19.32 |
| 2026-04-01 12:00 |
07:10:05.83 |
+24:47:02.3 |
HIP 34704 |
17.36 |
| 2026-04-02 00:00 |
07:10:13.68 |
+24:46:07.2 |
HIP 34704 |
15.36 |
| 2026-04-02 12:00 |
07:10:21.76 |
+24:45:11.9 |
HIP 34704 |
13.31 |
| 2026-04-03 00:00 |
07:10:30.05 |
+24:44:16.3 |
HIP 34704 |
11.21 |
| 2026-04-03 12:00 |
07:10:38.55 |
+24:43:20.6 |
HIP 34704 |
9.07 |
| 2026-04-04 00:00 |
07:10:47.27 |
+24:42:24.6 |
HIP 34704 |
6.89 |
| 2026-04-04 12:00 |
07:10:56.19 |
+24:41:28.3 |
HIP 34704 |
4.66 |
| 2026-04-05 00:00 |
07:11:05.32 |
+24:40:31.9 |
HIP 34704 |
2.39 |
| 2026-04-05 12:00 |
07:11:14.67 |
+24:39:35.2 |
HIP 34704 |
0.29 |
| 2026-04-06 00:00 |
07:11:24.22 |
+24:38:38.3 |
HIP 34704 |
2.33 |
| 2026-04-06 12:00 |
07:11:33.97 |
+24:37:41.1 |
HIP 34704 |
4.74 |
| 2026-04-07 00:00 |
07:11:43.93 |
+24:36:43.7 |
HIP 34704 |
7.19 |
| 2026-04-07 12:00 |
07:11:54.10 |
+24:35:46.1 |
HIP 34704 |
9.69 |
| 2026-04-08 00:00 |
07:12:04.46 |
+24:34:48.3 |
HIP 34704 |
12.23 |
| 2026-04-08 12:00 |
07:12:15.03 |
+24:33:50.2 |
HIP 34704 |
14.82 |
| 2026-04-09 00:00 |
07:12:25.79 |
+24:32:51.9 |
HIP 34704 |
17.45 |
| 2026-04-09 12:00 |
07:12:36.76 |
+24:31:53.3 |
HIP 34704 |
20.13 |
| 2026-04-10 00:00 |
07:12:47.92 |
+24:30:54.6 |
HIP 34704 |
22.85 |
| 2026-04-10 12:00 |
07:12:59.27 |
+24:29:55.5 |
HIP 34819 |
23.43 |
| 2026-04-11 00:00 |
07:13:10.82 |
+24:28:56.3 |
HIP 34995 |
22.02 |
| 2026-04-11 12:00 |
07:13:22.57 |
+24:27:56.8 |
HIP 34995 |
20.70 |
| 2026-04-12 00:00 |
07:13:34.50 |
+24:26:57.1 |
HIP 34995 |
19.67 |
| 2026-04-12 12:00 |
07:13:46.63 |
+24:25:57.1 |
HIP 34995 |
19.02 |
| 2026-04-13 00:00 |
07:13:58.95 |
+24:24:56.9 |
HIP 34995 |
18.80 |
| 2026-04-13 12:00 |
07:14:11.45 |
+24:23:56.5 |
HIP 34995 |
19.04 |
| 2026-04-14 00:00 |
07:14:24.14 |
+24:22:55.8 |
HIP 34995 |
19.75 |
| 2026-04-14 12:00 |
07:14:37.02 |
+24:21:54.8 |
HIP 34995 |
20.89 |
| 2026-04-15 00:00 |
07:14:50.08 |
+24:20:53.7 |
HIP 34995 |
22.42 |
| 2026-04-15 12:00 |
07:15:03.33 |
+24:19:52.2 |
HIP 34995 |
24.29 |
| 2026-04-16 00:00 |
07:15:16.75 |
+24:18:50.6 |
HIP 35224 |
24.78 |