C/2016 VZ18 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
19:42:24.76 |
-26:55:47.3 |
HIP 97125 |
26.54 |
| 2026-02-03 12:00 |
19:42:30.28 |
-26:55:38.8 |
HIP 97125 |
25.31 |
| 2026-02-04 00:00 |
19:42:35.79 |
-26:55:30.4 |
HIP 97125 |
24.09 |
| 2026-02-04 12:00 |
19:42:41.28 |
-26:55:22.1 |
HIP 97125 |
22.88 |
| 2026-02-05 00:00 |
19:42:46.75 |
-26:55:13.8 |
HIP 97125 |
21.68 |
| 2026-02-05 12:00 |
19:42:52.21 |
-26:55:05.6 |
HIP 97125 |
20.48 |
| 2026-02-06 00:00 |
19:42:57.65 |
-26:54:57.6 |
HIP 97125 |
19.28 |
| 2026-02-06 12:00 |
19:43:03.07 |
-26:54:49.6 |
HIP 97125 |
18.10 |
| 2026-02-07 00:00 |
19:43:08.47 |
-26:54:41.7 |
HIP 97125 |
16.92 |
| 2026-02-07 12:00 |
19:43:13.85 |
-26:54:33.8 |
HIP 97125 |
15.75 |
| 2026-02-08 00:00 |
19:43:19.21 |
-26:54:26.1 |
HIP 97125 |
14.59 |
| 2026-02-08 12:00 |
19:43:24.55 |
-26:54:18.5 |
HIP 97125 |
13.45 |
| 2026-02-09 00:00 |
19:43:29.87 |
-26:54:10.9 |
HIP 97125 |
12.31 |
| 2026-02-09 12:00 |
19:43:35.17 |
-26:54:03.5 |
HIP 97125 |
11.19 |
| 2026-02-10 00:00 |
19:43:40.45 |
-26:53:56.2 |
HIP 97125 |
10.10 |
| 2026-02-10 12:00 |
19:43:45.71 |
-26:53:48.9 |
HIP 97125 |
9.03 |
| 2026-02-11 00:00 |
19:43:50.95 |
-26:53:41.7 |
HIP 97125 |
7.99 |
| 2026-02-11 12:00 |
19:43:56.17 |
-26:53:34.7 |
HIP 97125 |
7.00 |
| 2026-02-12 00:00 |
19:44:01.36 |
-26:53:27.7 |
HIP 97125 |
6.07 |
| 2026-02-12 12:00 |
19:44:06.53 |
-26:53:20.8 |
HIP 97125 |
5.25 |
| 2026-02-13 00:00 |
19:44:11.68 |
-26:53:14.1 |
HIP 97125 |
4.57 |
| 2026-02-13 12:00 |
19:44:16.80 |
-26:53:07.4 |
HIP 97125 |
4.11 |
| 2026-02-14 00:00 |
19:44:21.90 |
-26:53:00.8 |
HIP 97125 |
3.94 |
| 2026-02-14 12:00 |
19:44:26.98 |
-26:52:54.4 |
HIP 97125 |
4.09 |
| 2026-02-15 00:00 |
19:44:32.03 |
-26:52:48.0 |
HIP 97125 |
4.53 |
| 2026-02-15 12:00 |
19:44:37.06 |
-26:52:41.7 |
HIP 97125 |
5.18 |
| 2026-02-16 00:00 |
19:44:42.07 |
-26:52:35.6 |
HIP 97125 |
5.97 |
| 2026-02-16 12:00 |
19:44:47.04 |
-26:52:29.5 |
HIP 97125 |
6.84 |
| 2026-02-17 00:00 |
19:44:52.00 |
-26:52:23.6 |
HIP 97125 |
7.77 |
| 2026-02-17 12:00 |
19:44:56.92 |
-26:52:17.7 |
HIP 97125 |
8.74 |
| 2026-02-18 00:00 |
19:45:01.82 |
-26:52:12.0 |
HIP 97125 |
9.73 |
| 2026-02-18 12:00 |
19:45:06.69 |
-26:52:06.3 |
HIP 97125 |
10.73 |
| 2026-02-19 00:00 |
19:45:11.54 |
-26:52:00.8 |
HIP 97125 |
11.74 |
| 2026-02-19 12:00 |
19:45:16.36 |
-26:51:55.4 |
HIP 97125 |
12.76 |
| 2026-02-20 00:00 |
19:45:21.15 |
-26:51:50.1 |
HIP 97125 |
13.78 |
| 2026-02-20 12:00 |
19:45:25.91 |
-26:51:44.9 |
HIP 97125 |
14.81 |
| 2026-02-21 00:00 |
19:45:30.65 |
-26:51:39.8 |
HIP 97125 |
15.83 |
| 2026-02-21 12:00 |
19:45:35.35 |
-26:51:34.8 |
HIP 97125 |
16.85 |
| 2026-02-22 00:00 |
19:45:40.03 |
-26:51:30.0 |
HIP 97125 |
17.86 |
| 2026-02-22 12:00 |
19:45:44.68 |
-26:51:25.2 |
HIP 97125 |
18.87 |
| 2026-02-23 00:00 |
19:45:49.30 |
-26:51:20.6 |
HIP 97125 |
19.88 |
| 2026-02-23 12:00 |
19:45:53.88 |
-26:51:16.1 |
HIP 97125 |
20.89 |
| 2026-02-24 00:00 |
19:45:58.44 |
-26:51:11.7 |
HIP 97125 |
21.89 |