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) |
| 2026-09-20 00:00 |
21:51:06.53 |
-15:49:47.6 |
HIP 107805 |
24.32 |
| 2026-09-20 12:00 |
21:51:05.02 |
-15:49:55.1 |
HIP 107805 |
24.06 |
| 2026-09-21 00:00 |
21:51:03.51 |
-15:50:02.5 |
HIP 107805 |
23.80 |
| 2026-09-21 12:00 |
21:51:02.02 |
-15:50:09.9 |
HIP 107805 |
23.54 |
| 2026-09-22 00:00 |
21:51:00.53 |
-15:50:17.2 |
HIP 107805 |
23.29 |
| 2026-09-22 12:00 |
21:50:59.05 |
-15:50:24.5 |
HIP 107805 |
23.04 |
| 2026-09-23 00:00 |
21:50:57.58 |
-15:50:31.7 |
HIP 107805 |
22.80 |
| 2026-09-23 12:00 |
21:50:56.12 |
-15:50:38.8 |
HIP 107805 |
22.56 |
| 2026-09-24 00:00 |
21:50:54.66 |
-15:50:45.9 |
HIP 107805 |
22.33 |
| 2026-09-24 12:00 |
21:50:53.22 |
-15:50:52.9 |
HIP 107805 |
22.10 |
| 2026-09-25 00:00 |
21:50:51.79 |
-15:50:59.9 |
HIP 107805 |
21.88 |
| 2026-09-25 12:00 |
21:50:50.36 |
-15:51:06.8 |
HIP 107805 |
21.67 |
| 2026-09-26 00:00 |
21:50:48.95 |
-15:51:13.7 |
HIP 107805 |
21.46 |
| 2026-09-26 12:00 |
21:50:47.54 |
-15:51:20.5 |
HIP 107805 |
21.25 |
| 2026-09-27 00:00 |
21:50:46.15 |
-15:51:27.2 |
HIP 107805 |
21.06 |
| 2026-09-27 12:00 |
21:50:44.76 |
-15:51:33.9 |
HIP 107805 |
20.86 |
| 2026-09-28 00:00 |
21:50:43.39 |
-15:51:40.5 |
HIP 107805 |
20.68 |
| 2026-09-28 12:00 |
21:50:42.02 |
-15:51:47.0 |
HIP 107805 |
20.50 |
| 2026-09-29 00:00 |
21:50:40.67 |
-15:51:53.5 |
HIP 107805 |
20.32 |
| 2026-09-29 12:00 |
21:50:39.32 |
-15:52:00.0 |
HIP 107805 |
20.15 |
| 2026-09-30 00:00 |
21:50:37.99 |
-15:52:06.3 |
HIP 107805 |
19.99 |
| 2026-09-30 12:00 |
21:50:36.66 |
-15:52:12.6 |
HIP 107805 |
19.83 |
| 2026-10-01 00:00 |
21:50:35.35 |
-15:52:18.8 |
HIP 107805 |
19.68 |
| 2026-10-01 12:00 |
21:50:34.05 |
-15:52:25.0 |
HIP 107805 |
19.53 |
| 2026-10-02 00:00 |
21:50:32.76 |
-15:52:31.1 |
HIP 107805 |
19.39 |
| 2026-10-02 12:00 |
21:50:31.48 |
-15:52:37.1 |
HIP 107805 |
19.26 |
| 2026-10-03 00:00 |
21:50:30.21 |
-15:52:43.1 |
HIP 107805 |
19.13 |
| 2026-10-03 12:00 |
21:50:28.95 |
-15:52:49.0 |
HIP 107805 |
19.01 |
| 2026-10-04 00:00 |
21:50:27.70 |
-15:52:54.9 |
HIP 107805 |
18.89 |
| 2026-10-04 12:00 |
21:50:26.46 |
-15:53:00.7 |
HIP 107805 |
18.78 |
| 2026-10-05 00:00 |
21:50:25.24 |
-15:53:06.4 |
HIP 107805 |
18.67 |
| 2026-10-05 12:00 |
21:50:24.03 |
-15:53:12.0 |
HIP 107805 |
18.57 |
| 2026-10-06 00:00 |
21:50:22.82 |
-15:53:17.6 |
HIP 107805 |
18.48 |
| 2026-10-06 12:00 |
21:50:21.63 |
-15:53:23.1 |
HIP 107805 |
18.39 |
| 2026-10-07 00:00 |
21:50:20.46 |
-15:53:28.5 |
HIP 107805 |
18.31 |
| 2026-10-07 12:00 |
21:50:19.29 |
-15:53:33.9 |
HIP 107805 |
18.23 |
| 2026-10-08 00:00 |
21:50:18.14 |
-15:53:39.2 |
HIP 107805 |
18.16 |
| 2026-10-08 12:00 |
21:50:16.99 |
-15:53:44.4 |
HIP 107805 |
18.09 |
| 2026-10-09 00:00 |
21:50:15.86 |
-15:53:49.6 |
HIP 107805 |
18.03 |
| 2026-10-09 12:00 |
21:50:14.75 |
-15:53:54.6 |
HIP 107805 |
17.97 |
| 2026-10-10 00:00 |
21:50:13.64 |
-15:53:59.7 |
HIP 107805 |
17.92 |
| 2026-10-10 12:00 |
21:50:12.55 |
-15:54:04.6 |
HIP 107805 |
17.88 |
| 2026-10-11 00:00 |
21:50:11.47 |
-15:54:09.5 |
HIP 107805 |
17.84 |