4P/Faye
メタデータ
| 項目 |
値 |
| Designation |
4P/Faye |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-09-05T16:51:28.051200Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T17:40:35Z |
| Obs used |
3565 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
9.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2019-02-09.0000000 |
| e |
0.58445627 |
| q (au) |
1.578180 |
| a (au) |
3.797867 |
| i (deg) |
8.159059 |
| Ω (om, deg) |
194.793848 |
| ω (w, deg) |
205.996302 |
| M (ma, deg) |
234.863274 |
等級
散乱 + 全体線形
$$
M_a = (9.881 + 3.887\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.881 |
| n |
3.887 |
| 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 |
| 2021-03-26 |
2021-09-05 |
+0.9240 |
-0.810 |
| 2021-09-06 |
2023-03-25 |
+0.7621 |
-0.738 |
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 |
15:53:39.14 |
-15:26:19.7 |
HIP 77874 |
15.48 |
| 2026-02-03 12:00 |
15:53:50.56 |
-15:26:23.3 |
HIP 77874 |
14.29 |
| 2026-02-04 00:00 |
15:54:01.85 |
-15:26:26.3 |
HIP 77874 |
13.59 |
| 2026-02-04 12:00 |
15:54:13.01 |
-15:26:28.7 |
HIP 77874 |
13.41 |
| 2026-02-05 00:00 |
15:54:24.02 |
-15:26:30.5 |
HIP 77874 |
13.77 |
| 2026-02-05 12:00 |
15:54:34.90 |
-15:26:31.6 |
HIP 77874 |
14.61 |
| 2026-02-06 00:00 |
15:54:45.65 |
-15:26:32.2 |
HIP 77874 |
15.83 |
| 2026-02-06 12:00 |
15:54:56.25 |
-15:26:32.2 |
HIP 77874 |
17.34 |
| 2026-02-07 00:00 |
15:55:06.72 |
-15:26:31.6 |
HIP 77874 |
19.06 |
| 2026-02-07 12:00 |
15:55:17.04 |
-15:26:30.4 |
HIP 78010 |
18.35 |
| 2026-02-08 00:00 |
15:55:27.23 |
-15:26:28.6 |
HIP 78010 |
17.53 |
| 2026-02-08 12:00 |
15:55:37.27 |
-15:26:26.2 |
HIP 78010 |
17.02 |
| 2026-02-09 00:00 |
15:55:47.16 |
-15:26:23.1 |
HIP 78010 |
16.84 |
| 2026-02-09 12:00 |
15:55:56.92 |
-15:26:19.5 |
HIP 78115 |
16.06 |
| 2026-02-10 00:00 |
15:56:06.53 |
-15:26:15.3 |
HIP 78115 |
13.78 |
| 2026-02-10 12:00 |
15:56:15.99 |
-15:26:10.4 |
HIP 78115 |
11.56 |
| 2026-02-11 00:00 |
15:56:25.31 |
-15:26:05.0 |
HIP 78115 |
9.41 |
| 2026-02-11 12:00 |
15:56:34.47 |
-15:25:59.0 |
HIP 78115 |
7.35 |
| 2026-02-12 00:00 |
15:56:43.49 |
-15:25:52.3 |
HIP 78115 |
5.45 |
| 2026-02-12 12:00 |
15:56:52.36 |
-15:25:45.0 |
HIP 78115 |
3.89 |
| 2026-02-13 00:00 |
15:57:01.08 |
-15:25:37.2 |
HIP 78115 |
3.12 |
| 2026-02-13 12:00 |
15:57:09.65 |
-15:25:28.7 |
HIP 78115 |
3.63 |
| 2026-02-14 00:00 |
15:57:18.06 |
-15:25:19.6 |
HIP 78115 |
4.99 |
| 2026-02-14 12:00 |
15:57:26.32 |
-15:25:09.9 |
HIP 78115 |
6.68 |
| 2026-02-15 00:00 |
15:57:34.43 |
-15:24:59.6 |
HIP 78115 |
8.48 |
| 2026-02-15 12:00 |
15:57:42.38 |
-15:24:48.7 |
HIP 78211 |
8.78 |
| 2026-02-16 00:00 |
15:57:50.18 |
-15:24:37.2 |
HIP 78211 |
7.25 |
| 2026-02-16 12:00 |
15:57:57.81 |
-15:24:25.1 |
HIP 78211 |
5.95 |
| 2026-02-17 00:00 |
15:58:05.30 |
-15:24:12.4 |
HIP 78211 |
5.05 |
| 2026-02-17 12:00 |
15:58:12.62 |
-15:23:59.1 |
HIP 78211 |
4.72 |
| 2026-02-18 00:00 |
15:58:19.78 |
-15:23:45.1 |
HIP 78211 |
5.05 |
| 2026-02-18 12:00 |
15:58:26.78 |
-15:23:30.6 |
HIP 78211 |
5.88 |
| 2026-02-19 00:00 |
15:58:33.62 |
-15:23:15.4 |
HIP 78211 |
7.02 |
| 2026-02-19 12:00 |
15:58:40.31 |
-15:22:59.7 |
HIP 78211 |
8.31 |
| 2026-02-20 00:00 |
15:58:46.82 |
-15:22:43.3 |
HIP 78239 |
9.09 |
| 2026-02-20 12:00 |
15:58:53.18 |
-15:22:26.4 |
HIP 78239 |
9.55 |
| 2026-02-21 00:00 |
15:58:59.37 |
-15:22:08.8 |
HIP 78239 |
10.19 |
| 2026-02-21 12:00 |
15:59:05.40 |
-15:21:50.6 |
HIP 78239 |
10.97 |
| 2026-02-22 00:00 |
15:59:11.26 |
-15:21:31.9 |
HIP 78239 |
11.85 |
| 2026-02-22 12:00 |
15:59:16.95 |
-15:21:12.5 |
HIP 78239 |
12.80 |
| 2026-02-23 00:00 |
15:59:22.48 |
-15:20:52.6 |
HIP 78239 |
13.78 |
| 2026-02-23 12:00 |
15:59:27.85 |
-15:20:32.0 |
HIP 78239 |
14.78 |
| 2026-02-24 00:00 |
15:59:33.04 |
-15:20:10.8 |
HIP 78239 |
15.80 |