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
$$
M_a = (9.888 + 3.879\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.888 |
| n |
3.879 |
| 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 |
+0.9434 |
-0.816 |
| 2021-09-06 |
2023-03-25 |
+0.6989 |
-0.717 |
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) |
| 2026-06-01 00:00 |
15:28:01.02 |
-12:04:48.7 |
HIP 75669 |
14.69 |
| 2026-06-01 12:00 |
15:27:44.54 |
-12:03:47.7 |
HIP 75669 |
14.52 |
| 2026-06-02 00:00 |
15:27:28.13 |
-12:02:47.2 |
HIP 75669 |
15.49 |
| 2026-06-02 12:00 |
15:27:11.79 |
-12:01:47.3 |
HIP 75669 |
17.40 |
| 2026-06-03 00:00 |
15:26:55.52 |
-12:00:47.9 |
HIP 75669 |
19.97 |
| 2026-06-03 12:00 |
15:26:39.34 |
-11:59:49.1 |
HIP 75554 |
19.67 |
| 2026-06-04 00:00 |
15:26:23.23 |
-11:58:50.8 |
HIP 75554 |
17.44 |
| 2026-06-04 12:00 |
15:26:07.20 |
-11:57:53.1 |
HIP 75554 |
15.96 |
| 2026-06-05 00:00 |
15:25:51.25 |
-11:56:56.1 |
HIP 75554 |
15.43 |
| 2026-06-05 12:00 |
15:25:35.39 |
-11:55:59.6 |
HIP 75554 |
15.93 |
| 2026-06-06 00:00 |
15:25:19.61 |
-11:55:03.7 |
HIP 75554 |
17.35 |
| 2026-06-06 12:00 |
15:25:03.93 |
-11:54:08.4 |
HIP 75554 |
19.48 |
| 2026-06-07 00:00 |
15:24:48.33 |
-11:53:13.7 |
HIP 75554 |
22.10 |
| 2026-06-07 12:00 |
15:24:32.83 |
-11:52:19.6 |
HIP 75554 |
25.04 |
| 2026-06-08 00:00 |
15:24:17.42 |
-11:51:26.2 |
HIP 75554 |
28.21 |
| 2026-06-08 12:00 |
15:24:02.11 |
-11:50:33.4 |
HIP 75300 |
27.04 |
| 2026-06-09 00:00 |
15:23:46.90 |
-11:49:41.2 |
HIP 75300 |
24.55 |
| 2026-06-09 12:00 |
15:23:31.79 |
-11:48:49.7 |
HIP 75300 |
22.46 |
| 2026-06-10 00:00 |
15:23:16.78 |
-11:47:58.9 |
HIP 75300 |
20.87 |
| 2026-06-10 12:00 |
15:23:01.88 |
-11:47:08.7 |
HIP 75300 |
19.89 |
| 2026-06-11 00:00 |
15:22:47.08 |
-11:46:19.2 |
HIP 75300 |
19.59 |
| 2026-06-11 12:00 |
15:22:32.40 |
-11:45:30.4 |
HIP 75300 |
19.99 |
| 2026-06-12 00:00 |
15:22:17.82 |
-11:44:42.2 |
HIP 75300 |
21.03 |
| 2026-06-12 12:00 |
15:22:03.36 |
-11:43:54.8 |
HIP 75300 |
22.61 |
| 2026-06-13 00:00 |
15:21:49.01 |
-11:43:08.0 |
HIP 75154 |
22.73 |
| 2026-06-13 12:00 |
15:21:34.78 |
-11:42:22.0 |
HIP 75154 |
23.12 |
| 2026-06-14 00:00 |
15:21:20.66 |
-11:41:36.6 |
HIP 75154 |
24.01 |
| 2026-06-14 12:00 |
15:21:06.67 |
-11:40:52.0 |
HIP 75154 |
25.36 |
| 2026-06-15 00:00 |
15:20:52.80 |
-11:40:08.1 |
HIP 75154 |
27.07 |
| 2026-06-15 12:00 |
15:20:39.05 |
-11:39:24.9 |
HIP 75154 |
29.07 |
| 2026-06-16 00:00 |
15:20:25.43 |
-11:38:42.5 |
HIP 75028 |
29.15 |
| 2026-06-16 12:00 |
15:20:11.94 |
-11:38:00.8 |
HIP 75028 |
27.69 |
| 2026-06-17 00:00 |
15:19:58.58 |
-11:37:19.8 |
HIP 75028 |
26.60 |
| 2026-06-17 12:00 |
15:19:45.35 |
-11:36:39.6 |
HIP 75028 |
25.92 |
| 2026-06-18 00:00 |
15:19:32.25 |
-11:36:00.1 |
HIP 75028 |
25.65 |
| 2026-06-18 12:00 |
15:19:19.28 |
-11:35:21.4 |
HIP 75028 |
25.80 |
| 2026-06-19 00:00 |
15:19:06.45 |
-11:34:43.5 |
HIP 75028 |
26.35 |
| 2026-06-19 12:00 |
15:18:53.76 |
-11:34:06.3 |
HIP 75028 |
27.26 |
| 2026-06-20 00:00 |
15:18:41.20 |
-11:33:29.9 |
HIP 75028 |
28.48 |
| 2026-06-20 12:00 |
15:18:28.79 |
-11:32:54.3 |
HIP 75028 |
29.98 |
| 2026-06-21 00:00 |
15:18:16.52 |
-11:32:19.4 |
HIP 75028 |
31.69 |
| 2026-06-21 12:00 |
15:18:04.39 |
-11:31:45.3 |
HIP 75028 |
33.57 |
| 2026-06-22 00:00 |
15:17:52.40 |
-11:31:12.0 |
HIP 74774 |
33.64 |