メタデータ
| 項目 |
値 |
| Designation |
C/1988 A1 (Liller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-03-31T02:45:25.882560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
427 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1988-04-26.0000000 |
| e |
0.99656338 |
| q (au) |
0.841336 |
| a (au) |
244.814711 |
| i (deg) |
73.322355 |
| Ω (om, deg) |
31.515349 |
| ω (w, deg) |
57.387934 |
| M (ma, deg) |
0.006660 |
等級
散乱 + 全体線形
$$
M_a = (4.936 + 3.835\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.936 |
| n |
3.835 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1988-01-12 |
1988-03-31 |
+0.6520 |
+0.817 |
| 1988-04-03 |
1988-08-12 |
-0.1051 |
-0.062 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
13:41:38.83 |
-57:22:42.7 |
HIP 66793 |
4.68 |
| 2026-03-26 12:00 |
13:41:35.69 |
-57:22:45.0 |
HIP 66793 |
4.46 |
| 2026-03-27 00:00 |
13:41:32.54 |
-57:22:47.1 |
HIP 66793 |
4.28 |
| 2026-03-27 12:00 |
13:41:29.38 |
-57:22:49.0 |
HIP 66793 |
4.15 |
| 2026-03-28 00:00 |
13:41:26.21 |
-57:22:50.7 |
HIP 66793 |
4.05 |
| 2026-03-28 12:00 |
13:41:23.03 |
-57:22:52.2 |
HIP 66793 |
4.00 |
| 2026-03-29 00:00 |
13:41:19.84 |
-57:22:53.5 |
HIP 66793 |
4.00 |
| 2026-03-29 12:00 |
13:41:16.64 |
-57:22:54.6 |
HIP 66793 |
4.05 |
| 2026-03-30 00:00 |
13:41:13.43 |
-57:22:55.5 |
HIP 66793 |
4.15 |
| 2026-03-30 12:00 |
13:41:10.21 |
-57:22:56.2 |
HIP 66793 |
4.29 |
| 2026-03-31 00:00 |
13:41:06.98 |
-57:22:56.8 |
HIP 66793 |
4.48 |
| 2026-03-31 12:00 |
13:41:03.74 |
-57:22:57.1 |
HIP 66793 |
4.70 |
| 2026-04-01 00:00 |
13:41:00.50 |
-57:22:57.2 |
HIP 66793 |
4.95 |
| 2026-04-01 12:00 |
13:40:57.24 |
-57:22:57.1 |
HIP 66793 |
5.23 |
| 2026-04-02 00:00 |
13:40:53.98 |
-57:22:56.8 |
HIP 66793 |
5.54 |
| 2026-04-02 12:00 |
13:40:50.71 |
-57:22:56.3 |
HIP 66793 |
5.86 |
| 2026-04-03 00:00 |
13:40:47.43 |
-57:22:55.6 |
HIP 66793 |
6.20 |
| 2026-04-03 12:00 |
13:40:44.14 |
-57:22:54.8 |
HIP 66793 |
6.56 |
| 2026-04-04 00:00 |
13:40:40.85 |
-57:22:53.7 |
HIP 66748 |
6.64 |
| 2026-04-04 12:00 |
13:40:37.55 |
-57:22:52.4 |
HIP 66748 |
6.72 |
| 2026-04-05 00:00 |
13:40:34.25 |
-57:22:50.9 |
HIP 66748 |
6.82 |
| 2026-04-05 12:00 |
13:40:30.93 |
-57:22:49.2 |
HIP 66748 |
6.95 |
| 2026-04-06 00:00 |
13:40:27.61 |
-57:22:47.4 |
HIP 66748 |
7.11 |
| 2026-04-06 12:00 |
13:40:24.29 |
-57:22:45.3 |
HIP 66748 |
7.28 |
| 2026-04-07 00:00 |
13:40:20.96 |
-57:22:43.0 |
HIP 66748 |
7.48 |
| 2026-04-07 12:00 |
13:40:17.62 |
-57:22:40.6 |
HIP 66748 |
7.69 |
| 2026-04-08 00:00 |
13:40:14.28 |
-57:22:37.9 |
HIP 66632 |
7.87 |
| 2026-04-08 12:00 |
13:40:10.94 |
-57:22:35.0 |
HIP 66632 |
7.48 |
| 2026-04-09 00:00 |
13:40:07.59 |
-57:22:32.0 |
HIP 66632 |
7.11 |
| 2026-04-09 12:00 |
13:40:04.23 |
-57:22:28.7 |
HIP 66632 |
6.74 |
| 2026-04-10 00:00 |
13:40:00.88 |
-57:22:25.3 |
HIP 66632 |
6.38 |
| 2026-04-10 12:00 |
13:39:57.51 |
-57:22:21.6 |
HIP 66632 |
6.03 |
| 2026-04-11 00:00 |
13:39:54.15 |
-57:22:17.8 |
HIP 66632 |
5.69 |
| 2026-04-11 12:00 |
13:39:50.78 |
-57:22:13.7 |
HIP 66632 |
5.36 |
| 2026-04-12 00:00 |
13:39:47.41 |
-57:22:09.5 |
HIP 66632 |
5.06 |
| 2026-04-12 12:00 |
13:39:44.03 |
-57:22:05.0 |
HIP 66632 |
4.77 |
| 2026-04-13 00:00 |
13:39:40.66 |
-57:22:00.4 |
HIP 66632 |
4.52 |
| 2026-04-13 12:00 |
13:39:37.28 |
-57:21:55.6 |
HIP 66632 |
4.29 |
| 2026-04-14 00:00 |
13:39:33.90 |
-57:21:50.6 |
HIP 66632 |
4.10 |
| 2026-04-14 12:00 |
13:39:30.51 |
-57:21:45.4 |
HIP 66632 |
3.95 |
| 2026-04-15 00:00 |
13:39:27.13 |
-57:21:40.0 |
HIP 66632 |
3.85 |
| 2026-04-15 12:00 |
13:39:23.74 |
-57:21:34.4 |
HIP 66632 |
3.80 |
| 2026-04-16 00:00 |
13:39:20.36 |
-57:21:28.6 |
HIP 66632 |
3.81 |