C/2020 PV6 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2020 PV6 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-25T23:59:11.313600Z |
| Orbit solution date (soln_date, UTC) |
2024-07-30T14:57:24Z |
| Obs used |
1749 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
17.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-09-30.0000000 |
| e |
0.94495091 |
| q (au) |
2.295631 |
| a (au) |
41.701535 |
| i (deg) |
128.239287 |
| Ω (om, deg) |
329.143872 |
| ω (w, deg) |
71.380642 |
| M (ma, deg) |
0.014642 |
等級
散乱 + 全体線形
$$
M_a = (6.667 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.667 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2021-05-30 |
2021-09-22 |
+4.0425 |
-1.521 |
| 2021-09-26 |
2022-05-23 |
+13.2958 |
-5.599 |
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 |
08:41:20.22 |
-02:49:52.0 |
HIP 42700 |
17.97 |
| 2026-02-03 12:00 |
08:41:08.82 |
-02:49:22.2 |
HIP 42700 |
20.35 |
| 2026-02-04 00:00 |
08:40:57.44 |
-02:48:52.0 |
HIP 42565 |
19.85 |
| 2026-02-04 12:00 |
08:40:46.08 |
-02:48:21.4 |
HIP 42565 |
18.76 |
| 2026-02-05 00:00 |
08:40:34.73 |
-02:47:50.4 |
HIP 42565 |
18.06 |
| 2026-02-05 12:00 |
08:40:23.40 |
-02:47:18.9 |
HIP 42565 |
17.80 |
| 2026-02-06 00:00 |
08:40:12.10 |
-02:46:47.0 |
HIP 42565 |
17.99 |
| 2026-02-06 12:00 |
08:40:00.81 |
-02:46:14.6 |
HIP 42565 |
18.62 |
| 2026-02-07 00:00 |
08:39:49.54 |
-02:45:41.9 |
HIP 42565 |
19.65 |
| 2026-02-07 12:00 |
08:39:38.30 |
-02:45:08.8 |
HIP 42565 |
21.01 |
| 2026-02-08 00:00 |
08:39:27.07 |
-02:44:35.2 |
HIP 42565 |
22.64 |
| 2026-02-08 12:00 |
08:39:15.87 |
-02:44:01.2 |
HIP 42565 |
24.49 |
| 2026-02-09 00:00 |
08:39:04.70 |
-02:43:26.9 |
HIP 42565 |
26.51 |
| 2026-02-09 12:00 |
08:38:53.55 |
-02:42:52.1 |
HIP 42565 |
28.66 |
| 2026-02-10 00:00 |
08:38:42.43 |
-02:42:17.0 |
HIP 42565 |
30.91 |
| 2026-02-10 12:00 |
08:38:31.34 |
-02:41:41.5 |
HIP 42565 |
33.25 |
| 2026-02-11 00:00 |
08:38:20.28 |
-02:41:05.6 |
HIP 42565 |
35.65 |
| 2026-02-11 12:00 |
08:38:09.24 |
-02:40:29.3 |
HIP 42565 |
38.10 |
| 2026-02-12 00:00 |
08:37:58.24 |
-02:39:52.7 |
HIP 42280 |
38.32 |
| 2026-02-12 12:00 |
08:37:47.26 |
-02:39:15.7 |
HIP 42280 |
37.03 |
| 2026-02-13 00:00 |
08:37:36.32 |
-02:38:38.3 |
HIP 42280 |
35.92 |
| 2026-02-13 12:00 |
08:37:25.42 |
-02:38:00.6 |
HIP 42280 |
34.99 |
| 2026-02-14 00:00 |
08:37:14.54 |
-02:37:22.5 |
HIP 42280 |
34.26 |
| 2026-02-14 12:00 |
08:37:03.71 |
-02:36:44.1 |
HIP 42280 |
33.73 |
| 2026-02-15 00:00 |
08:36:52.91 |
-02:36:05.4 |
HIP 42280 |
33.43 |
| 2026-02-15 12:00 |
08:36:42.14 |
-02:35:26.3 |
HIP 42081 |
32.61 |
| 2026-02-16 00:00 |
08:36:31.42 |
-02:34:46.9 |
HIP 42081 |
30.29 |
| 2026-02-16 12:00 |
08:36:20.73 |
-02:34:07.2 |
HIP 42081 |
28.06 |
| 2026-02-17 00:00 |
08:36:10.08 |
-02:33:27.1 |
HIP 42081 |
25.94 |
| 2026-02-17 12:00 |
08:35:59.48 |
-02:32:46.8 |
HIP 42081 |
23.95 |
| 2026-02-18 00:00 |
08:35:48.91 |
-02:32:06.1 |
HIP 42081 |
22.14 |
| 2026-02-18 12:00 |
08:35:38.39 |
-02:31:25.2 |
HIP 42081 |
20.55 |
| 2026-02-19 00:00 |
08:35:27.91 |
-02:30:43.9 |
HIP 42081 |
19.21 |
| 2026-02-19 12:00 |
08:35:17.48 |
-02:30:02.4 |
HIP 42081 |
18.19 |
| 2026-02-20 00:00 |
08:35:07.09 |
-02:29:20.6 |
HIP 42081 |
17.55 |
| 2026-02-20 12:00 |
08:34:56.75 |
-02:28:38.5 |
HIP 42081 |
17.30 |
| 2026-02-21 00:00 |
08:34:46.45 |
-02:27:56.1 |
HIP 42081 |
17.48 |
| 2026-02-21 12:00 |
08:34:36.20 |
-02:27:13.5 |
HIP 42081 |
18.05 |
| 2026-02-22 00:00 |
08:34:26.00 |
-02:26:30.7 |
HIP 42028 |
18.45 |
| 2026-02-22 12:00 |
08:34:15.85 |
-02:25:47.5 |
HIP 42028 |
17.07 |
| 2026-02-23 00:00 |
08:34:05.75 |
-02:25:04.2 |
HIP 42028 |
16.01 |
| 2026-02-23 12:00 |
08:33:55.70 |
-02:24:20.6 |
HIP 42028 |
15.32 |
| 2026-02-24 00:00 |
08:33:45.70 |
-02:23:36.7 |
HIP 42028 |
15.05 |