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 |
-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
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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
13:34:33.53 |
-56:59:54.7 |
HIP 65968 |
30.36 |
| 2026-06-03 00:00 |
13:34:31.23 |
-56:59:35.1 |
HIP 65968 |
30.30 |
| 2026-06-03 12:00 |
13:34:28.95 |
-56:59:15.4 |
HIP 65968 |
30.25 |
| 2026-06-04 00:00 |
13:34:26.69 |
-56:58:55.7 |
HIP 65968 |
30.22 |
| 2026-06-04 12:00 |
13:34:24.46 |
-56:58:35.8 |
HIP 65968 |
30.19 |
| 2026-06-05 00:00 |
13:34:22.25 |
-56:58:15.9 |
HIP 65968 |
30.17 |
| 2026-06-05 12:00 |
13:34:20.05 |
-56:57:55.9 |
HIP 65968 |
30.16 |
| 2026-06-06 00:00 |
13:34:17.89 |
-56:57:35.8 |
HIP 65968 |
30.16 |
| 2026-06-06 12:00 |
13:34:15.74 |
-56:57:15.7 |
HIP 65968 |
30.18 |
| 2026-06-07 00:00 |
13:34:13.61 |
-56:56:55.5 |
HIP 65968 |
30.20 |
| 2026-06-07 12:00 |
13:34:11.51 |
-56:56:35.2 |
HIP 65968 |
30.23 |
| 2026-06-08 00:00 |
13:34:09.43 |
-56:56:14.9 |
HIP 65968 |
30.27 |
| 2026-06-08 12:00 |
13:34:07.37 |
-56:55:54.5 |
HIP 65968 |
30.31 |
| 2026-06-09 00:00 |
13:34:05.34 |
-56:55:34.0 |
HIP 65968 |
30.37 |
| 2026-06-09 12:00 |
13:34:03.32 |
-56:55:13.5 |
HIP 65968 |
30.44 |
| 2026-06-10 00:00 |
13:34:01.33 |
-56:54:52.9 |
HIP 65968 |
30.51 |
| 2026-06-10 12:00 |
13:33:59.37 |
-56:54:32.2 |
HIP 65968 |
30.60 |
| 2026-06-11 00:00 |
13:33:57.43 |
-56:54:11.5 |
HIP 65968 |
30.69 |
| 2026-06-11 12:00 |
13:33:55.51 |
-56:53:50.8 |
HIP 65968 |
30.79 |
| 2026-06-12 00:00 |
13:33:53.61 |
-56:53:30.0 |
HIP 65968 |
30.90 |
| 2026-06-12 12:00 |
13:33:51.74 |
-56:53:09.1 |
HIP 65968 |
31.02 |
| 2026-06-13 00:00 |
13:33:49.89 |
-56:52:48.2 |
HIP 65968 |
31.15 |
| 2026-06-13 12:00 |
13:33:48.07 |
-56:52:27.3 |
HIP 65968 |
31.28 |
| 2026-06-14 00:00 |
13:33:46.27 |
-56:52:06.2 |
HIP 65968 |
31.42 |
| 2026-06-14 12:00 |
13:33:44.49 |
-56:51:45.2 |
HIP 65968 |
31.57 |
| 2026-06-15 00:00 |
13:33:42.74 |
-56:51:24.1 |
HIP 66136 |
31.57 |
| 2026-06-15 12:00 |
13:33:41.01 |
-56:51:03.0 |
HIP 66136 |
31.20 |
| 2026-06-16 00:00 |
13:33:39.31 |
-56:50:41.8 |
HIP 66136 |
30.84 |
| 2026-06-16 12:00 |
13:33:37.64 |
-56:50:20.6 |
HIP 66136 |
30.47 |
| 2026-06-17 00:00 |
13:33:35.98 |
-56:49:59.4 |
HIP 66136 |
30.11 |
| 2026-06-17 12:00 |
13:33:34.36 |
-56:49:38.1 |
HIP 66136 |
29.75 |
| 2026-06-18 00:00 |
13:33:32.76 |
-56:49:16.8 |
HIP 66136 |
29.38 |
| 2026-06-18 12:00 |
13:33:31.18 |
-56:48:55.4 |
HIP 66136 |
29.02 |
| 2026-06-19 00:00 |
13:33:29.63 |
-56:48:34.1 |
HIP 66136 |
28.66 |
| 2026-06-19 12:00 |
13:33:28.10 |
-56:48:12.7 |
HIP 66136 |
28.30 |
| 2026-06-20 00:00 |
13:33:26.60 |
-56:47:51.3 |
HIP 66136 |
27.95 |
| 2026-06-20 12:00 |
13:33:25.13 |
-56:47:29.8 |
HIP 66136 |
27.59 |
| 2026-06-21 00:00 |
13:33:23.68 |
-56:47:08.4 |
HIP 66136 |
27.24 |
| 2026-06-21 12:00 |
13:33:22.25 |
-56:46:46.9 |
HIP 66136 |
26.88 |
| 2026-06-22 00:00 |
13:33:20.85 |
-56:46:25.4 |
HIP 66136 |
26.53 |