メタデータ
| 項目 |
値 |
| Designation |
C/1987 T1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1987-09-09T04:04:28.231680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
31.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1987-10-24.0000000 |
| e |
0.99999043 |
| q (au) |
0.515261 |
| a (au) |
53860.674252 |
| i (deg) |
62.532659 |
| Ω (om, deg) |
143.730188 |
| ω (w, deg) |
13.191234 |
| M (ma, deg) |
0.000004 |
等級
散乱 + 全体線形
$$
M_a = (7.708 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.708 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-06-01 00:00 |
21:56:18.40 |
-15:19:35.7 |
HIP 108176 |
19.28 |
| 2026-06-01 12:00 |
21:56:18.02 |
-15:19:39.4 |
HIP 108176 |
19.20 |
| 2026-06-02 00:00 |
21:56:17.62 |
-15:19:43.3 |
HIP 108176 |
19.12 |
| 2026-06-02 12:00 |
21:56:17.20 |
-15:19:47.1 |
HIP 108176 |
19.04 |
| 2026-06-03 00:00 |
21:56:16.77 |
-15:19:51.1 |
HIP 108176 |
18.95 |
| 2026-06-03 12:00 |
21:56:16.33 |
-15:19:55.1 |
HIP 108176 |
18.86 |
| 2026-06-04 00:00 |
21:56:15.87 |
-15:19:59.3 |
HIP 108176 |
18.77 |
| 2026-06-04 12:00 |
21:56:15.39 |
-15:20:03.4 |
HIP 108176 |
18.68 |
| 2026-06-05 00:00 |
21:56:14.90 |
-15:20:07.7 |
HIP 108176 |
18.58 |
| 2026-06-05 12:00 |
21:56:14.40 |
-15:20:12.0 |
HIP 108176 |
18.48 |
| 2026-06-06 00:00 |
21:56:13.88 |
-15:20:16.4 |
HIP 108176 |
18.38 |
| 2026-06-06 12:00 |
21:56:13.35 |
-15:20:20.9 |
HIP 108176 |
18.28 |
| 2026-06-07 00:00 |
21:56:12.80 |
-15:20:25.5 |
HIP 108176 |
18.17 |
| 2026-06-07 12:00 |
21:56:12.24 |
-15:20:30.1 |
HIP 108176 |
18.06 |
| 2026-06-08 00:00 |
21:56:11.66 |
-15:20:34.8 |
HIP 108176 |
17.95 |
| 2026-06-08 12:00 |
21:56:11.07 |
-15:20:39.6 |
HIP 108176 |
17.84 |
| 2026-06-09 00:00 |
21:56:10.47 |
-15:20:44.4 |
HIP 108176 |
17.72 |
| 2026-06-09 12:00 |
21:56:09.85 |
-15:20:49.3 |
HIP 108176 |
17.60 |
| 2026-06-10 00:00 |
21:56:09.21 |
-15:20:54.3 |
HIP 108176 |
17.48 |
| 2026-06-10 12:00 |
21:56:08.57 |
-15:20:59.4 |
HIP 108176 |
17.36 |
| 2026-06-11 00:00 |
21:56:07.90 |
-15:21:04.5 |
HIP 108176 |
17.24 |
| 2026-06-11 12:00 |
21:56:07.23 |
-15:21:09.7 |
HIP 108176 |
17.11 |
| 2026-06-12 00:00 |
21:56:06.54 |
-15:21:14.9 |
HIP 108176 |
16.98 |
| 2026-06-12 12:00 |
21:56:05.83 |
-15:21:20.3 |
HIP 108176 |
16.85 |
| 2026-06-13 00:00 |
21:56:05.11 |
-15:21:25.7 |
HIP 108176 |
16.72 |
| 2026-06-13 12:00 |
21:56:04.38 |
-15:21:31.2 |
HIP 108176 |
16.59 |
| 2026-06-14 00:00 |
21:56:03.64 |
-15:21:36.7 |
HIP 108176 |
16.46 |
| 2026-06-14 12:00 |
21:56:02.88 |
-15:21:42.3 |
HIP 108176 |
16.32 |
| 2026-06-15 00:00 |
21:56:02.10 |
-15:21:48.0 |
HIP 108176 |
16.19 |
| 2026-06-15 12:00 |
21:56:01.31 |
-15:21:53.7 |
HIP 108176 |
16.05 |
| 2026-06-16 00:00 |
21:56:00.51 |
-15:21:59.5 |
HIP 108176 |
15.91 |
| 2026-06-16 12:00 |
21:55:59.70 |
-15:22:05.4 |
HIP 108176 |
15.78 |
| 2026-06-17 00:00 |
21:55:58.87 |
-15:22:11.4 |
HIP 108176 |
15.64 |
| 2026-06-17 12:00 |
21:55:58.02 |
-15:22:17.4 |
HIP 108176 |
15.50 |
| 2026-06-18 00:00 |
21:55:57.17 |
-15:22:23.4 |
HIP 108176 |
15.36 |
| 2026-06-18 12:00 |
21:55:56.30 |
-15:22:29.6 |
HIP 108176 |
15.22 |
| 2026-06-19 00:00 |
21:55:55.42 |
-15:22:35.8 |
HIP 108176 |
15.08 |
| 2026-06-19 12:00 |
21:55:54.52 |
-15:22:42.1 |
HIP 108176 |
14.94 |
| 2026-06-20 00:00 |
21:55:53.61 |
-15:22:48.4 |
HIP 108176 |
14.80 |
| 2026-06-20 12:00 |
21:55:52.69 |
-15:22:54.8 |
HIP 108176 |
14.66 |
| 2026-06-21 00:00 |
21:55:51.75 |
-15:23:01.2 |
HIP 108176 |
14.52 |
| 2026-06-21 12:00 |
21:55:50.80 |
-15:23:07.7 |
HIP 108176 |
14.38 |
| 2026-06-22 00:00 |
21:55:49.84 |
-15:23:14.3 |
HIP 108176 |
14.25 |