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) |
| 2026-07-29 00:00 |
19:38:06.57 |
-27:44:51.4 |
HIP 96645 |
25.13 |
| 2026-07-29 12:00 |
19:38:01.37 |
-27:45:02.6 |
HIP 96645 |
25.83 |
| 2026-07-30 00:00 |
19:37:56.17 |
-27:45:13.7 |
HIP 96645 |
26.55 |
| 2026-07-30 12:00 |
19:37:50.99 |
-27:45:24.7 |
HIP 96645 |
27.30 |
| 2026-07-31 00:00 |
19:37:45.83 |
-27:45:35.6 |
HIP 96645 |
28.08 |
| 2026-07-31 12:00 |
19:37:40.68 |
-27:45:46.4 |
HIP 96645 |
28.87 |
| 2026-08-01 00:00 |
19:37:35.54 |
-27:45:57.1 |
HIP 96645 |
29.69 |
| 2026-08-01 12:00 |
19:37:30.42 |
-27:46:07.7 |
HIP 96645 |
30.53 |
| 2026-08-02 00:00 |
19:37:25.31 |
-27:46:18.1 |
HIP 96645 |
31.38 |
| 2026-08-02 12:00 |
19:37:20.22 |
-27:46:28.4 |
HIP 96645 |
32.25 |
| 2026-08-03 00:00 |
19:37:15.15 |
-27:46:38.7 |
HIP 96645 |
33.13 |
| 2026-08-03 12:00 |
19:37:10.09 |
-27:46:48.8 |
HIP 96332 |
33.32 |
| 2026-08-04 00:00 |
19:37:05.05 |
-27:46:58.8 |
HIP 96332 |
32.53 |
| 2026-08-04 12:00 |
19:37:00.02 |
-27:47:08.6 |
HIP 96332 |
31.76 |
| 2026-08-05 00:00 |
19:36:55.02 |
-27:47:18.4 |
HIP 96332 |
31.01 |
| 2026-08-05 12:00 |
19:36:50.03 |
-27:47:28.0 |
HIP 96332 |
30.29 |
| 2026-08-06 00:00 |
19:36:45.06 |
-27:47:37.6 |
HIP 96332 |
29.59 |
| 2026-08-06 12:00 |
19:36:40.11 |
-27:47:47.0 |
HIP 96332 |
28.93 |
| 2026-08-07 00:00 |
19:36:35.18 |
-27:47:56.3 |
HIP 96332 |
28.29 |
| 2026-08-07 12:00 |
19:36:30.27 |
-27:48:05.4 |
HIP 96332 |
27.68 |
| 2026-08-08 00:00 |
19:36:25.37 |
-27:48:14.5 |
HIP 96332 |
27.10 |
| 2026-08-08 12:00 |
19:36:20.50 |
-27:48:23.4 |
HIP 96332 |
26.56 |
| 2026-08-09 00:00 |
19:36:15.66 |
-27:48:32.2 |
HIP 96332 |
26.05 |
| 2026-08-09 12:00 |
19:36:10.83 |
-27:48:40.9 |
HIP 96332 |
25.58 |
| 2026-08-10 00:00 |
19:36:06.02 |
-27:48:49.5 |
HIP 96332 |
25.15 |
| 2026-08-10 12:00 |
19:36:01.24 |
-27:48:57.9 |
HIP 96332 |
24.76 |
| 2026-08-11 00:00 |
19:35:56.48 |
-27:49:06.3 |
HIP 96332 |
24.41 |
| 2026-08-11 12:00 |
19:35:51.74 |
-27:49:14.5 |
HIP 96332 |
24.10 |
| 2026-08-12 00:00 |
19:35:47.03 |
-27:49:22.5 |
HIP 96332 |
23.83 |
| 2026-08-12 12:00 |
19:35:42.34 |
-27:49:30.5 |
HIP 96332 |
23.61 |
| 2026-08-13 00:00 |
19:35:37.68 |
-27:49:38.3 |
HIP 96332 |
23.43 |
| 2026-08-13 12:00 |
19:35:33.04 |
-27:49:46.0 |
HIP 96332 |
23.29 |
| 2026-08-14 00:00 |
19:35:28.43 |
-27:49:53.6 |
HIP 96332 |
23.20 |
| 2026-08-14 12:00 |
19:35:23.84 |
-27:50:01.0 |
HIP 96332 |
23.16 |
| 2026-08-15 00:00 |
19:35:19.28 |
-27:50:08.4 |
HIP 96332 |
23.16 |
| 2026-08-15 12:00 |
19:35:14.75 |
-27:50:15.6 |
HIP 96332 |
23.20 |
| 2026-08-16 00:00 |
19:35:10.24 |
-27:50:22.6 |
HIP 96332 |
23.28 |
| 2026-08-16 12:00 |
19:35:05.76 |
-27:50:29.6 |
HIP 96332 |
23.40 |
| 2026-08-17 00:00 |
19:35:01.31 |
-27:50:36.4 |
HIP 96332 |
23.57 |
| 2026-08-17 12:00 |
19:34:56.88 |
-27:50:43.1 |
HIP 96332 |
23.77 |
| 2026-08-18 00:00 |
19:34:52.49 |
-27:50:49.6 |
HIP 96332 |
24.00 |
| 2026-08-18 12:00 |
19:34:48.12 |
-27:50:56.1 |
HIP 96332 |
24.27 |
| 2026-08-19 00:00 |
19:34:43.78 |
-27:51:02.4 |
HIP 96332 |
24.57 |