メタデータ
| 項目 |
値 |
| Designation |
C/1984 U1 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1984-09-03T10:51:18.192960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
8.100 |
| K1 |
7.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1985-06-15.0000000 |
| e |
0.99440837 |
| q (au) |
5.489111 |
| a (au) |
981.666043 |
| i (deg) |
179.212301 |
| Ω (om, deg) |
238.298457 |
| ω (w, deg) |
182.819832 |
| M (ma, deg) |
0.009118 |
等級
散乱 + 全体線形
$$
M_a = (5.830 + 3.472\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.830 |
| n |
3.472 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:53:45.59 |
-23:50:22.4 |
HIP 87527 |
25.31 |
| 2026-07-29 12:00 |
17:53:43.83 |
-23:50:22.0 |
HIP 87527 |
25.14 |
| 2026-07-30 00:00 |
17:53:42.08 |
-23:50:21.5 |
HIP 87527 |
24.97 |
| 2026-07-30 12:00 |
17:53:40.35 |
-23:50:21.1 |
HIP 87527 |
24.81 |
| 2026-07-31 00:00 |
17:53:38.63 |
-23:50:20.7 |
HIP 87527 |
24.65 |
| 2026-07-31 12:00 |
17:53:36.91 |
-23:50:20.3 |
HIP 87527 |
24.51 |
| 2026-08-01 00:00 |
17:53:35.21 |
-23:50:19.9 |
HIP 87527 |
24.36 |
| 2026-08-01 12:00 |
17:53:33.53 |
-23:50:19.5 |
HIP 87527 |
24.23 |
| 2026-08-02 00:00 |
17:53:31.85 |
-23:50:19.1 |
HIP 87527 |
24.10 |
| 2026-08-02 12:00 |
17:53:30.18 |
-23:50:18.7 |
HIP 87527 |
23.97 |
| 2026-08-03 00:00 |
17:53:28.53 |
-23:50:18.3 |
HIP 87527 |
23.86 |
| 2026-08-03 12:00 |
17:53:26.89 |
-23:50:17.8 |
HIP 87527 |
23.75 |
| 2026-08-04 00:00 |
17:53:25.26 |
-23:50:17.4 |
HIP 87527 |
23.64 |
| 2026-08-04 12:00 |
17:53:23.64 |
-23:50:17.0 |
HIP 87527 |
23.54 |
| 2026-08-05 00:00 |
17:53:22.04 |
-23:50:16.6 |
HIP 87527 |
23.45 |
| 2026-08-05 12:00 |
17:53:20.45 |
-23:50:16.2 |
HIP 87527 |
23.36 |
| 2026-08-06 00:00 |
17:53:18.87 |
-23:50:15.8 |
HIP 87527 |
23.28 |
| 2026-08-06 12:00 |
17:53:17.30 |
-23:50:15.4 |
HIP 87527 |
23.21 |
| 2026-08-07 00:00 |
17:53:15.75 |
-23:50:14.9 |
HIP 87527 |
23.14 |
| 2026-08-07 12:00 |
17:53:14.21 |
-23:50:14.5 |
HIP 87527 |
23.08 |
| 2026-08-08 00:00 |
17:53:12.68 |
-23:50:14.1 |
HIP 87527 |
23.02 |
| 2026-08-08 12:00 |
17:53:11.16 |
-23:50:13.7 |
HIP 87527 |
22.97 |
| 2026-08-09 00:00 |
17:53:09.66 |
-23:50:13.3 |
HIP 87399 |
22.82 |
| 2026-08-09 12:00 |
17:53:08.17 |
-23:50:12.9 |
HIP 87399 |
22.51 |
| 2026-08-10 00:00 |
17:53:06.70 |
-23:50:12.5 |
HIP 87399 |
22.20 |
| 2026-08-10 12:00 |
17:53:05.24 |
-23:50:12.0 |
HIP 87399 |
21.90 |
| 2026-08-11 00:00 |
17:53:03.79 |
-23:50:11.6 |
HIP 87399 |
21.60 |
| 2026-08-11 12:00 |
17:53:02.36 |
-23:50:11.2 |
HIP 87399 |
21.30 |
| 2026-08-12 00:00 |
17:53:00.94 |
-23:50:10.8 |
HIP 87399 |
21.01 |
| 2026-08-12 12:00 |
17:52:59.53 |
-23:50:10.4 |
HIP 87399 |
20.72 |
| 2026-08-13 00:00 |
17:52:58.14 |
-23:50:10.0 |
HIP 87399 |
20.43 |
| 2026-08-13 12:00 |
17:52:56.77 |
-23:50:09.6 |
HIP 87399 |
20.15 |
| 2026-08-14 00:00 |
17:52:55.40 |
-23:50:09.2 |
HIP 87399 |
19.88 |
| 2026-08-14 12:00 |
17:52:54.06 |
-23:50:08.7 |
HIP 87399 |
19.60 |
| 2026-08-15 00:00 |
17:52:52.72 |
-23:50:08.3 |
HIP 87399 |
19.33 |
| 2026-08-15 12:00 |
17:52:51.40 |
-23:50:07.9 |
HIP 87399 |
19.07 |
| 2026-08-16 00:00 |
17:52:50.10 |
-23:50:07.5 |
HIP 87399 |
18.81 |
| 2026-08-16 12:00 |
17:52:48.81 |
-23:50:07.1 |
HIP 87399 |
18.55 |
| 2026-08-17 00:00 |
17:52:47.54 |
-23:50:06.7 |
HIP 87399 |
18.29 |
| 2026-08-17 12:00 |
17:52:46.28 |
-23:50:06.3 |
HIP 87399 |
18.04 |
| 2026-08-18 00:00 |
17:52:45.03 |
-23:50:05.9 |
HIP 87399 |
17.80 |
| 2026-08-18 12:00 |
17:52:43.80 |
-23:50:05.5 |
HIP 87399 |
17.56 |
| 2026-08-19 00:00 |
17:52:42.59 |
-23:50:05.1 |
HIP 87399 |
17.32 |