メタデータ
| 項目 |
値 |
| Designation |
C/1988 L1 (Shoemaker-Holt-Rodriquez) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-06-12T11:09:22.452480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1988-11-06.0000000 |
| e |
1.00067716 |
| q (au) |
2.474297 |
| a (au) |
-3653.923503 |
| i (deg) |
97.688560 |
| Ω (om, deg) |
115.255065 |
| ω (w, deg) |
232.145920 |
| M (ma, deg) |
-0.000975 |
等級
散乱 + 全体線形
$$
M_a = (7.401 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.401 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.685 |
| k |
0.999 |
| δ90 |
9.990 |
| 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) |
| 2026-03-26 00:00 |
07:51:43.27 |
+50:08:22.7 |
HIP 38443 |
7.94 |
| 2026-03-26 12:00 |
07:51:42.16 |
+50:08:12.0 |
HIP 38443 |
8.15 |
| 2026-03-27 00:00 |
07:51:41.08 |
+50:08:01.2 |
HIP 38443 |
8.37 |
| 2026-03-27 12:00 |
07:51:40.02 |
+50:07:50.4 |
HIP 38443 |
8.58 |
| 2026-03-28 00:00 |
07:51:38.98 |
+50:07:39.5 |
HIP 38443 |
8.79 |
| 2026-03-28 12:00 |
07:51:37.97 |
+50:07:28.5 |
HIP 38443 |
9.00 |
| 2026-03-29 00:00 |
07:51:36.99 |
+50:07:17.4 |
HIP 38443 |
9.20 |
| 2026-03-29 12:00 |
07:51:36.03 |
+50:07:06.3 |
HIP 38443 |
9.41 |
| 2026-03-30 00:00 |
07:51:35.10 |
+50:06:55.1 |
HIP 38443 |
9.61 |
| 2026-03-30 12:00 |
07:51:34.19 |
+50:06:43.8 |
HIP 38443 |
9.81 |
| 2026-03-31 00:00 |
07:51:33.31 |
+50:06:32.4 |
HIP 38443 |
10.01 |
| 2026-03-31 12:00 |
07:51:32.45 |
+50:06:21.0 |
HIP 38443 |
10.21 |
| 2026-04-01 00:00 |
07:51:31.62 |
+50:06:09.5 |
HIP 38443 |
10.41 |
| 2026-04-01 12:00 |
07:51:30.81 |
+50:05:57.9 |
HIP 38443 |
10.60 |
| 2026-04-02 00:00 |
07:51:30.03 |
+50:05:46.3 |
HIP 38443 |
10.79 |
| 2026-04-02 12:00 |
07:51:29.28 |
+50:05:34.6 |
HIP 38443 |
10.98 |
| 2026-04-03 00:00 |
07:51:28.55 |
+50:05:22.8 |
HIP 38443 |
11.17 |
| 2026-04-03 12:00 |
07:51:27.85 |
+50:05:10.9 |
HIP 38443 |
11.36 |
| 2026-04-04 00:00 |
07:51:27.17 |
+50:04:59.0 |
HIP 38443 |
11.55 |
| 2026-04-04 12:00 |
07:51:26.52 |
+50:04:47.1 |
HIP 38443 |
11.73 |
| 2026-04-05 00:00 |
07:51:25.89 |
+50:04:35.1 |
HIP 38443 |
11.91 |
| 2026-04-05 12:00 |
07:51:25.29 |
+50:04:23.0 |
HIP 38443 |
12.09 |
| 2026-04-06 00:00 |
07:51:24.71 |
+50:04:10.8 |
HIP 38443 |
12.27 |
| 2026-04-06 12:00 |
07:51:24.17 |
+50:03:58.6 |
HIP 38443 |
12.45 |
| 2026-04-07 00:00 |
07:51:23.64 |
+50:03:46.4 |
HIP 38443 |
12.62 |
| 2026-04-07 12:00 |
07:51:23.15 |
+50:03:34.0 |
HIP 38443 |
12.80 |
| 2026-04-08 00:00 |
07:51:22.67 |
+50:03:21.7 |
HIP 38443 |
12.97 |
| 2026-04-08 12:00 |
07:51:22.23 |
+50:03:09.2 |
HIP 38443 |
13.14 |
| 2026-04-09 00:00 |
07:51:21.81 |
+50:02:56.8 |
HIP 38443 |
13.31 |
| 2026-04-09 12:00 |
07:51:21.42 |
+50:02:44.2 |
HIP 38443 |
13.48 |
| 2026-04-10 00:00 |
07:51:21.05 |
+50:02:31.6 |
HIP 38443 |
13.64 |
| 2026-04-10 12:00 |
07:51:20.71 |
+50:02:19.0 |
HIP 38443 |
13.81 |
| 2026-04-11 00:00 |
07:51:20.39 |
+50:02:06.3 |
HIP 38443 |
13.97 |
| 2026-04-11 12:00 |
07:51:20.10 |
+50:01:53.6 |
HIP 38443 |
14.13 |
| 2026-04-12 00:00 |
07:51:19.84 |
+50:01:40.8 |
HIP 38443 |
14.29 |
| 2026-04-12 12:00 |
07:51:19.60 |
+50:01:27.9 |
HIP 38443 |
14.45 |
| 2026-04-13 00:00 |
07:51:19.39 |
+50:01:15.1 |
HIP 38443 |
14.61 |
| 2026-04-13 12:00 |
07:51:19.20 |
+50:01:02.1 |
HIP 38443 |
14.76 |
| 2026-04-14 00:00 |
07:51:19.04 |
+50:00:49.2 |
HIP 38443 |
14.92 |
| 2026-04-14 12:00 |
07:51:18.91 |
+50:00:36.2 |
HIP 38443 |
15.07 |
| 2026-04-15 00:00 |
07:51:18.80 |
+50:00:23.1 |
HIP 38443 |
15.23 |
| 2026-04-15 12:00 |
07:51:18.72 |
+50:00:10.0 |
HIP 38443 |
15.38 |
| 2026-04-16 00:00 |
07:51:18.66 |
+49:59:56.9 |
HIP 38443 |
15.53 |