メタデータ
| 項目 |
値 |
| Designation |
C/1988 F1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-11-29T22:34:57.907200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
4.800 |
| K1 |
19.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1988-05-22.0000000 |
| e |
0.99771483 |
| q (au) |
1.174205 |
| a (au) |
513.837337 |
| i (deg) |
62.807742 |
| Ω (om, deg) |
288.763862 |
| ω (w, deg) |
326.514381 |
| M (ma, deg) |
0.014729 |
等級
散乱 + 全体線形
$$
M_a = (11.001 + 2.109\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.001 |
| n |
2.109 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
04:53:58.50 |
+64:20:19.7 |
HIP 22961 |
16.41 |
| 2026-05-12 12:00 |
04:54:02.50 |
+64:20:13.7 |
HIP 22961 |
16.01 |
| 2026-05-13 00:00 |
04:54:06.51 |
+64:20:07.8 |
HIP 22961 |
15.62 |
| 2026-05-13 12:00 |
04:54:10.54 |
+64:20:02.1 |
HIP 22961 |
15.22 |
| 2026-05-14 00:00 |
04:54:14.57 |
+64:19:56.6 |
HIP 22961 |
14.83 |
| 2026-05-14 12:00 |
04:54:18.63 |
+64:19:51.2 |
HIP 22961 |
14.44 |
| 2026-05-15 00:00 |
04:54:22.69 |
+64:19:45.9 |
HIP 22961 |
14.05 |
| 2026-05-15 12:00 |
04:54:26.77 |
+64:19:40.8 |
HIP 22961 |
13.66 |
| 2026-05-16 00:00 |
04:54:30.85 |
+64:19:35.9 |
HIP 22961 |
13.27 |
| 2026-05-16 12:00 |
04:54:34.95 |
+64:19:31.1 |
HIP 22961 |
12.88 |
| 2026-05-17 00:00 |
04:54:39.07 |
+64:19:26.4 |
HIP 22961 |
12.50 |
| 2026-05-17 12:00 |
04:54:43.19 |
+64:19:21.9 |
HIP 22961 |
12.11 |
| 2026-05-18 00:00 |
04:54:47.32 |
+64:19:17.6 |
HIP 22961 |
11.74 |
| 2026-05-18 12:00 |
04:54:51.47 |
+64:19:13.4 |
HIP 22961 |
11.36 |
| 2026-05-19 00:00 |
04:54:55.62 |
+64:19:09.3 |
HIP 22961 |
10.99 |
| 2026-05-19 12:00 |
04:54:59.78 |
+64:19:05.4 |
HIP 22961 |
10.62 |
| 2026-05-20 00:00 |
04:55:03.96 |
+64:19:01.7 |
HIP 22961 |
10.26 |
| 2026-05-20 12:00 |
04:55:08.14 |
+64:18:58.1 |
HIP 22961 |
9.90 |
| 2026-05-21 00:00 |
04:55:12.33 |
+64:18:54.7 |
HIP 22961 |
9.55 |
| 2026-05-21 12:00 |
04:55:16.53 |
+64:18:51.4 |
HIP 22961 |
9.20 |
| 2026-05-22 00:00 |
04:55:20.74 |
+64:18:48.2 |
HIP 22961 |
8.87 |
| 2026-05-22 12:00 |
04:55:24.96 |
+64:18:45.2 |
HIP 22961 |
8.54 |
| 2026-05-23 00:00 |
04:55:29.18 |
+64:18:42.4 |
HIP 22961 |
8.22 |
| 2026-05-23 12:00 |
04:55:33.42 |
+64:18:39.7 |
HIP 22961 |
7.92 |
| 2026-05-24 00:00 |
04:55:37.66 |
+64:18:37.2 |
HIP 22961 |
7.63 |
| 2026-05-24 12:00 |
04:55:41.90 |
+64:18:34.8 |
HIP 22961 |
7.35 |
| 2026-05-25 00:00 |
04:55:46.16 |
+64:18:32.6 |
HIP 22961 |
7.09 |
| 2026-05-25 12:00 |
04:55:50.42 |
+64:18:30.5 |
HIP 22961 |
6.85 |
| 2026-05-26 00:00 |
04:55:54.69 |
+64:18:28.6 |
HIP 22961 |
6.63 |
| 2026-05-26 12:00 |
04:55:58.96 |
+64:18:26.8 |
HIP 22961 |
6.43 |
| 2026-05-27 00:00 |
04:56:03.24 |
+64:18:25.2 |
HIP 22961 |
6.26 |
| 2026-05-27 12:00 |
04:56:07.52 |
+64:18:23.7 |
HIP 22961 |
6.11 |
| 2026-05-28 00:00 |
04:56:11.81 |
+64:18:22.4 |
HIP 22961 |
6.00 |
| 2026-05-28 12:00 |
04:56:16.10 |
+64:18:21.2 |
HIP 22961 |
5.91 |
| 2026-05-29 00:00 |
04:56:20.40 |
+64:18:20.1 |
HIP 22961 |
5.87 |
| 2026-05-29 12:00 |
04:56:24.71 |
+64:18:19.3 |
HIP 22961 |
5.85 |
| 2026-05-30 00:00 |
04:56:29.01 |
+64:18:18.5 |
HIP 22961 |
5.87 |
| 2026-05-30 12:00 |
04:56:33.33 |
+64:18:18.0 |
HIP 22961 |
5.92 |
| 2026-05-31 00:00 |
04:56:37.64 |
+64:18:17.5 |
HIP 22961 |
6.01 |
| 2026-05-31 12:00 |
04:56:41.96 |
+64:18:17.3 |
HIP 22961 |
6.13 |
| 2026-06-01 00:00 |
04:56:46.28 |
+64:18:17.1 |
HIP 22961 |
6.28 |
| 2026-06-01 12:00 |
04:56:50.61 |
+64:18:17.2 |
HIP 22961 |
6.46 |
| 2026-06-02 00:00 |
04:56:54.94 |
+64:18:17.3 |
HIP 22961 |
6.66 |