メタデータ
| 項目 |
値 |
| Designation |
C/2016 VZ18 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-03-07T09:07:19.603200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:28Z |
| Obs used |
351 |
| NEO |
- |
| M1 |
18.400 |
| K1 |
9.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-20.0000000 |
| e |
0.99532240 |
| q (au) |
0.910266 |
| a (au) |
194.601204 |
| i (deg) |
24.035635 |
| Ω (om, deg) |
98.954808 |
| ω (w, deg) |
36.386221 |
| M (ma, deg) |
359.994416 |
等級
散乱 + 全体線形
$$
M_a = (14.990 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.990 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
19:49:36.66 |
-27:04:51.4 |
HIP 97648 |
22.39 |
| 2026-05-12 12:00 |
19:49:34.54 |
-27:05:05.7 |
HIP 97648 |
22.55 |
| 2026-05-13 00:00 |
19:49:32.37 |
-27:05:20.0 |
HIP 97648 |
22.73 |
| 2026-05-13 12:00 |
19:49:30.16 |
-27:05:34.5 |
HIP 97648 |
22.93 |
| 2026-05-14 00:00 |
19:49:27.91 |
-27:05:49.0 |
HIP 97648 |
23.14 |
| 2026-05-14 12:00 |
19:49:25.62 |
-27:06:03.6 |
HIP 97648 |
23.37 |
| 2026-05-15 00:00 |
19:49:23.27 |
-27:06:18.3 |
HIP 97648 |
23.62 |
| 2026-05-15 12:00 |
19:49:20.89 |
-27:06:33.0 |
HIP 97648 |
23.89 |
| 2026-05-16 00:00 |
19:49:18.46 |
-27:06:47.8 |
HIP 97648 |
24.17 |
| 2026-05-16 12:00 |
19:49:15.99 |
-27:07:02.7 |
HIP 97648 |
24.48 |
| 2026-05-17 00:00 |
19:49:13.48 |
-27:07:17.7 |
HIP 97648 |
24.80 |
| 2026-05-17 12:00 |
19:49:10.92 |
-27:07:32.7 |
HIP 97648 |
25.14 |
| 2026-05-18 00:00 |
19:49:08.32 |
-27:07:47.8 |
HIP 97648 |
25.50 |
| 2026-05-18 12:00 |
19:49:05.67 |
-27:08:03.0 |
HIP 97648 |
25.87 |
| 2026-05-19 00:00 |
19:49:02.99 |
-27:08:18.3 |
HIP 97648 |
26.27 |
| 2026-05-19 12:00 |
19:49:00.26 |
-27:08:33.6 |
HIP 97648 |
26.68 |
| 2026-05-20 00:00 |
19:48:57.49 |
-27:08:49.0 |
HIP 97648 |
27.11 |
| 2026-05-20 12:00 |
19:48:54.68 |
-27:09:04.4 |
HIP 97648 |
27.55 |
| 2026-05-21 00:00 |
19:48:51.83 |
-27:09:19.9 |
HIP 97648 |
28.02 |
| 2026-05-21 12:00 |
19:48:48.94 |
-27:09:35.5 |
HIP 97648 |
28.50 |
| 2026-05-22 00:00 |
19:48:46.00 |
-27:09:51.1 |
HIP 97648 |
28.99 |
| 2026-05-22 12:00 |
19:48:43.03 |
-27:10:06.8 |
HIP 97648 |
29.51 |
| 2026-05-23 00:00 |
19:48:40.01 |
-27:10:22.5 |
HIP 97648 |
30.04 |
| 2026-05-23 12:00 |
19:48:36.96 |
-27:10:38.3 |
HIP 97648 |
30.58 |
| 2026-05-24 00:00 |
19:48:33.87 |
-27:10:54.2 |
HIP 97287 |
30.34 |
| 2026-05-24 12:00 |
19:48:30.73 |
-27:11:10.1 |
HIP 97287 |
29.61 |
| 2026-05-25 00:00 |
19:48:27.56 |
-27:11:26.0 |
HIP 97287 |
28.87 |
| 2026-05-25 12:00 |
19:48:24.35 |
-27:11:42.0 |
HIP 97287 |
28.12 |
| 2026-05-26 00:00 |
19:48:21.10 |
-27:11:58.1 |
HIP 97287 |
27.37 |
| 2026-05-26 12:00 |
19:48:17.81 |
-27:12:14.2 |
HIP 97287 |
26.61 |
| 2026-05-27 00:00 |
19:48:14.48 |
-27:12:30.3 |
HIP 97287 |
25.84 |
| 2026-05-27 12:00 |
19:48:11.11 |
-27:12:46.5 |
HIP 97287 |
25.06 |
| 2026-05-28 00:00 |
19:48:07.71 |
-27:13:02.7 |
HIP 97287 |
24.28 |
| 2026-05-28 12:00 |
19:48:04.27 |
-27:13:19.0 |
HIP 97287 |
23.49 |
| 2026-05-29 00:00 |
19:48:00.79 |
-27:13:35.3 |
HIP 97287 |
22.69 |
| 2026-05-29 12:00 |
19:47:57.28 |
-27:13:51.7 |
HIP 97287 |
21.88 |
| 2026-05-30 00:00 |
19:47:53.73 |
-27:14:08.1 |
HIP 97287 |
21.07 |
| 2026-05-30 12:00 |
19:47:50.14 |
-27:14:24.5 |
HIP 97287 |
20.25 |
| 2026-05-31 00:00 |
19:47:46.52 |
-27:14:41.0 |
HIP 97287 |
19.43 |
| 2026-05-31 12:00 |
19:47:42.86 |
-27:14:57.5 |
HIP 97287 |
18.60 |
| 2026-06-01 00:00 |
19:47:39.16 |
-27:15:14.0 |
HIP 97287 |
17.77 |
| 2026-06-01 12:00 |
19:47:35.43 |
-27:15:30.5 |
HIP 97287 |
16.93 |
| 2026-06-02 00:00 |
19:47:31.67 |
-27:15:47.1 |
HIP 97287 |
16.09 |