327P/Van Ness
メタデータ
| 項目 |
値 |
| Designation |
327P/Van Ness |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-09-02T13:33:36.086400Z |
| Orbit solution date (soln_date, UTC) |
2024-06-21T13:42:21Z |
| Obs used |
900 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2020-09-26.0000000 |
| e |
0.56283038 |
| q (au) |
1.557541 |
| a (au) |
3.562783 |
| i (deg) |
36.245156 |
| Ω (om, deg) |
173.974419 |
| ω (w, deg) |
185.022025 |
| M (ma, deg) |
256.444765 |
等級
散乱 + 全体線形
$$
M_a = (14.824 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.824 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.648 |
| k |
0.800 |
| δ90 |
2.020 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2020-05-30 |
2022-06-02 |
-17.0330 |
+4.757 |
| 2022-06-02 |
2022-09-02 |
+6.7567 |
-1.443 |
| 2022-09-03 |
2023-01-20 |
-0.5936 |
+0.111 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
12:32:38.68 |
+00:55:38.1 |
HIP 61252 |
10.23 |
| 2026-02-03 12:00 |
12:32:32.49 |
+00:57:44.8 |
HIP 61252 |
10.24 |
| 2026-02-04 00:00 |
12:32:26.11 |
+00:59:52.7 |
HIP 61252 |
10.94 |
| 2026-02-04 12:00 |
12:32:19.56 |
+01:02:01.9 |
HIP 61252 |
12.24 |
| 2026-02-05 00:00 |
12:32:12.84 |
+01:04:12.3 |
HIP 61252 |
13.99 |
| 2026-02-05 12:00 |
12:32:05.94 |
+01:06:23.8 |
HIP 61252 |
16.07 |
| 2026-02-06 00:00 |
12:31:58.87 |
+01:08:36.6 |
HIP 61091 |
15.60 |
| 2026-02-06 12:00 |
12:31:51.63 |
+01:10:50.6 |
HIP 61091 |
12.75 |
| 2026-02-07 00:00 |
12:31:44.21 |
+01:13:05.7 |
HIP 61091 |
9.86 |
| 2026-02-07 12:00 |
12:31:36.62 |
+01:15:22.0 |
HIP 61091 |
6.95 |
| 2026-02-08 00:00 |
12:31:28.86 |
+01:17:39.4 |
HIP 61091 |
4.06 |
| 2026-02-08 12:00 |
12:31:20.93 |
+01:19:58.0 |
HIP 61091 |
1.61 |
| 2026-02-09 00:00 |
12:31:12.83 |
+01:22:17.8 |
HIP 61091 |
2.72 |
| 2026-02-09 12:00 |
12:31:04.56 |
+01:24:38.7 |
HIP 61091 |
5.62 |
| 2026-02-10 00:00 |
12:30:56.11 |
+01:27:00.7 |
HIP 61091 |
8.72 |
| 2026-02-10 12:00 |
12:30:47.50 |
+01:29:23.8 |
HIP 61091 |
11.90 |
| 2026-02-11 00:00 |
12:30:38.73 |
+01:31:48.1 |
HIP 61091 |
15.13 |
| 2026-02-11 12:00 |
12:30:29.78 |
+01:34:13.4 |
HIP 61091 |
18.41 |
| 2026-02-12 00:00 |
12:30:20.67 |
+01:36:39.8 |
HIP 61091 |
21.73 |
| 2026-02-12 12:00 |
12:30:11.40 |
+01:39:07.3 |
HIP 61091 |
25.10 |
| 2026-02-13 00:00 |
12:30:01.96 |
+01:41:35.9 |
HIP 60936 |
25.59 |
| 2026-02-13 12:00 |
12:29:52.36 |
+01:44:05.5 |
HIP 60936 |
22.21 |
| 2026-02-14 00:00 |
12:29:42.60 |
+01:46:36.2 |
HIP 60936 |
18.82 |
| 2026-02-14 12:00 |
12:29:32.67 |
+01:49:07.9 |
HIP 60936 |
15.44 |
| 2026-02-15 00:00 |
12:29:22.59 |
+01:51:40.6 |
HIP 60936 |
12.13 |
| 2026-02-15 12:00 |
12:29:12.34 |
+01:54:14.3 |
HIP 60936 |
9.02 |
| 2026-02-16 00:00 |
12:29:01.94 |
+01:56:48.9 |
HIP 60936 |
6.44 |
| 2026-02-16 12:00 |
12:28:51.39 |
+01:59:24.6 |
HIP 60936 |
5.35 |
| 2026-02-17 00:00 |
12:28:40.68 |
+02:02:01.2 |
HIP 60936 |
6.60 |
| 2026-02-17 12:00 |
12:28:29.81 |
+02:04:38.8 |
HIP 60936 |
9.34 |
| 2026-02-18 00:00 |
12:28:18.79 |
+02:07:17.3 |
HIP 60936 |
12.67 |
| 2026-02-18 12:00 |
12:28:07.62 |
+02:09:56.7 |
HIP 60936 |
16.25 |
| 2026-02-19 00:00 |
12:27:56.30 |
+02:12:37.1 |
HIP 60936 |
19.98 |
| 2026-02-19 12:00 |
12:27:44.84 |
+02:15:18.3 |
HIP 60713 |
21.11 |
| 2026-02-20 00:00 |
12:27:33.23 |
+02:18:00.4 |
HIP 60713 |
17.23 |
| 2026-02-20 12:00 |
12:27:21.47 |
+02:20:43.3 |
HIP 60713 |
13.37 |
| 2026-02-21 00:00 |
12:27:09.57 |
+02:23:27.1 |
HIP 60713 |
9.57 |
| 2026-02-21 12:00 |
12:26:57.52 |
+02:26:11.7 |
HIP 60713 |
6.06 |
| 2026-02-22 00:00 |
12:26:45.34 |
+02:28:57.1 |
HIP 60713 |
3.86 |
| 2026-02-22 12:00 |
12:26:33.02 |
+02:31:43.3 |
HIP 60713 |
5.18 |
| 2026-02-23 00:00 |
12:26:20.56 |
+02:34:30.2 |
HIP 60713 |
8.57 |
| 2026-02-23 12:00 |
12:26:07.97 |
+02:37:17.9 |
HIP 60713 |
12.48 |
| 2026-02-24 00:00 |
12:25:55.25 |
+02:40:06.4 |
HIP 60713 |
16.56 |