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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
19:47:27.87 |
-27:16:03.8 |
HIP 97287 |
15.25 |
| 2026-06-03 00:00 |
19:47:24.04 |
-27:16:20.4 |
HIP 97287 |
14.40 |
| 2026-06-03 12:00 |
19:47:20.17 |
-27:16:37.1 |
HIP 97287 |
13.55 |
| 2026-06-04 00:00 |
19:47:16.27 |
-27:16:53.8 |
HIP 97287 |
12.70 |
| 2026-06-04 12:00 |
19:47:12.33 |
-27:17:10.5 |
HIP 97287 |
11.86 |
| 2026-06-05 00:00 |
19:47:08.36 |
-27:17:27.3 |
HIP 97287 |
11.01 |
| 2026-06-05 12:00 |
19:47:04.36 |
-27:17:44.0 |
HIP 97287 |
10.18 |
| 2026-06-06 00:00 |
19:47:00.33 |
-27:18:00.8 |
HIP 97287 |
9.36 |
| 2026-06-06 12:00 |
19:46:56.26 |
-27:18:17.6 |
HIP 97287 |
8.55 |
| 2026-06-07 00:00 |
19:46:52.16 |
-27:18:34.4 |
HIP 97287 |
7.77 |
| 2026-06-07 12:00 |
19:46:48.03 |
-27:18:51.3 |
HIP 97287 |
7.03 |
| 2026-06-08 00:00 |
19:46:43.87 |
-27:19:08.1 |
HIP 97287 |
6.33 |
| 2026-06-08 12:00 |
19:46:39.68 |
-27:19:25.0 |
HIP 97287 |
5.72 |
| 2026-06-09 00:00 |
19:46:35.45 |
-27:19:41.9 |
HIP 97287 |
5.20 |
| 2026-06-09 12:00 |
19:46:31.20 |
-27:19:58.8 |
HIP 97287 |
4.84 |
| 2026-06-10 00:00 |
19:46:26.92 |
-27:20:15.7 |
HIP 97287 |
4.65 |
| 2026-06-10 12:00 |
19:46:22.60 |
-27:20:32.6 |
HIP 97287 |
4.67 |
| 2026-06-11 00:00 |
19:46:18.26 |
-27:20:49.5 |
HIP 97287 |
4.89 |
| 2026-06-11 12:00 |
19:46:13.89 |
-27:21:06.4 |
HIP 97287 |
5.31 |
| 2026-06-12 00:00 |
19:46:09.48 |
-27:21:23.3 |
HIP 97287 |
5.87 |
| 2026-06-12 12:00 |
19:46:05.05 |
-27:21:40.2 |
HIP 97287 |
6.55 |
| 2026-06-13 00:00 |
19:46:00.59 |
-27:21:57.2 |
HIP 97287 |
7.31 |
| 2026-06-13 12:00 |
19:45:56.11 |
-27:22:14.1 |
HIP 97287 |
8.13 |
| 2026-06-14 00:00 |
19:45:51.60 |
-27:22:31.0 |
HIP 97195 |
8.24 |
| 2026-06-14 12:00 |
19:45:47.06 |
-27:22:47.9 |
HIP 97195 |
7.20 |
| 2026-06-15 00:00 |
19:45:42.49 |
-27:23:04.8 |
HIP 97195 |
6.16 |
| 2026-06-15 12:00 |
19:45:37.90 |
-27:23:21.7 |
HIP 97195 |
5.12 |
| 2026-06-16 00:00 |
19:45:33.28 |
-27:23:38.6 |
HIP 97195 |
4.08 |
| 2026-06-16 12:00 |
19:45:28.63 |
-27:23:55.5 |
HIP 97195 |
3.05 |
| 2026-06-17 00:00 |
19:45:23.97 |
-27:24:12.4 |
HIP 97195 |
2.05 |
| 2026-06-17 12:00 |
19:45:19.27 |
-27:24:29.2 |
HIP 97195 |
1.20 |
| 2026-06-18 00:00 |
19:45:14.56 |
-27:24:46.1 |
HIP 97195 |
0.99 |
| 2026-06-18 12:00 |
19:45:09.82 |
-27:25:02.9 |
HIP 97195 |
1.70 |
| 2026-06-19 00:00 |
19:45:05.05 |
-27:25:19.7 |
HIP 97195 |
2.68 |
| 2026-06-19 12:00 |
19:45:00.27 |
-27:25:36.5 |
HIP 97195 |
3.73 |
| 2026-06-20 00:00 |
19:44:55.46 |
-27:25:53.2 |
HIP 97195 |
4.81 |
| 2026-06-20 12:00 |
19:44:50.63 |
-27:26:10.0 |
HIP 97195 |
5.90 |
| 2026-06-21 00:00 |
19:44:45.77 |
-27:26:26.7 |
HIP 97195 |
6.99 |
| 2026-06-21 12:00 |
19:44:40.90 |
-27:26:43.4 |
HIP 97195 |
8.10 |
| 2026-06-22 00:00 |
19:44:36.01 |
-27:27:00.1 |
HIP 97195 |
9.22 |