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) |
| 2026-05-12 00:00 |
13:36:30.06 |
-57:12:21.9 |
HIP 66529 |
22.48 |
| 2026-05-12 12:00 |
13:36:27.01 |
-57:12:07.1 |
HIP 66529 |
22.92 |
| 2026-05-13 00:00 |
13:36:23.98 |
-57:11:52.2 |
HIP 66529 |
23.37 |
| 2026-05-13 12:00 |
13:36:20.96 |
-57:11:37.1 |
HIP 66529 |
23.83 |
| 2026-05-14 00:00 |
13:36:17.95 |
-57:11:21.9 |
HIP 66529 |
24.28 |
| 2026-05-14 12:00 |
13:36:14.96 |
-57:11:06.5 |
HIP 66529 |
24.73 |
| 2026-05-15 00:00 |
13:36:11.98 |
-57:10:51.0 |
HIP 66529 |
25.19 |
| 2026-05-15 12:00 |
13:36:09.02 |
-57:10:35.4 |
HIP 66529 |
25.65 |
| 2026-05-16 00:00 |
13:36:06.07 |
-57:10:19.6 |
HIP 66529 |
26.11 |
| 2026-05-16 12:00 |
13:36:03.13 |
-57:10:03.7 |
HIP 66529 |
26.57 |
| 2026-05-17 00:00 |
13:36:00.21 |
-57:09:47.7 |
HIP 66529 |
27.03 |
| 2026-05-17 12:00 |
13:35:57.31 |
-57:09:31.6 |
HIP 66529 |
27.49 |
| 2026-05-18 00:00 |
13:35:54.42 |
-57:09:15.3 |
HIP 66529 |
27.95 |
| 2026-05-18 12:00 |
13:35:51.54 |
-57:08:58.9 |
HIP 66529 |
28.42 |
| 2026-05-19 00:00 |
13:35:48.69 |
-57:08:42.3 |
HIP 66529 |
28.88 |
| 2026-05-19 12:00 |
13:35:45.84 |
-57:08:25.7 |
HIP 66529 |
29.35 |
| 2026-05-20 00:00 |
13:35:43.02 |
-57:08:08.9 |
HIP 66529 |
29.81 |
| 2026-05-20 12:00 |
13:35:40.21 |
-57:07:52.0 |
HIP 66529 |
30.28 |
| 2026-05-21 00:00 |
13:35:37.41 |
-57:07:34.9 |
HIP 66529 |
30.74 |
| 2026-05-21 12:00 |
13:35:34.64 |
-57:07:17.8 |
HIP 66529 |
31.21 |
| 2026-05-22 00:00 |
13:35:31.88 |
-57:07:00.5 |
HIP 66529 |
31.67 |
| 2026-05-22 12:00 |
13:35:29.14 |
-57:06:43.1 |
HIP 66529 |
32.14 |
| 2026-05-23 00:00 |
13:35:26.41 |
-57:06:25.7 |
HIP 66529 |
32.60 |
| 2026-05-23 12:00 |
13:35:23.71 |
-57:06:08.1 |
HIP 66529 |
33.07 |
| 2026-05-24 00:00 |
13:35:21.02 |
-57:05:50.3 |
HIP 65968 |
33.19 |
| 2026-05-24 12:00 |
13:35:18.35 |
-57:05:32.5 |
HIP 65968 |
32.96 |
| 2026-05-25 00:00 |
13:35:15.69 |
-57:05:14.6 |
HIP 65968 |
32.74 |
| 2026-05-25 12:00 |
13:35:13.06 |
-57:04:56.5 |
HIP 65968 |
32.53 |
| 2026-05-26 00:00 |
13:35:10.44 |
-57:04:38.4 |
HIP 65968 |
32.33 |
| 2026-05-26 12:00 |
13:35:07.84 |
-57:04:20.2 |
HIP 65968 |
32.13 |
| 2026-05-27 00:00 |
13:35:05.27 |
-57:04:01.8 |
HIP 65968 |
31.95 |
| 2026-05-27 12:00 |
13:35:02.71 |
-57:03:43.4 |
HIP 65968 |
31.77 |
| 2026-05-28 00:00 |
13:35:00.16 |
-57:03:24.8 |
HIP 65968 |
31.60 |
| 2026-05-28 12:00 |
13:34:57.64 |
-57:03:06.2 |
HIP 65968 |
31.44 |
| 2026-05-29 00:00 |
13:34:55.14 |
-57:02:47.4 |
HIP 65968 |
31.29 |
| 2026-05-29 12:00 |
13:34:52.66 |
-57:02:28.6 |
HIP 65968 |
31.15 |
| 2026-05-30 00:00 |
13:34:50.20 |
-57:02:09.7 |
HIP 65968 |
31.02 |
| 2026-05-30 12:00 |
13:34:47.75 |
-57:01:50.7 |
HIP 65968 |
30.89 |
| 2026-05-31 00:00 |
13:34:45.33 |
-57:01:31.6 |
HIP 65968 |
30.78 |
| 2026-05-31 12:00 |
13:34:42.93 |
-57:01:12.4 |
HIP 65968 |
30.68 |
| 2026-06-01 00:00 |
13:34:40.55 |
-57:00:53.1 |
HIP 65968 |
30.58 |
| 2026-06-01 12:00 |
13:34:38.19 |
-57:00:33.7 |
HIP 65968 |
30.50 |
| 2026-06-02 00:00 |
13:34:35.85 |
-57:00:14.3 |
HIP 65968 |
30.42 |