C/1988 A1 (Liller)
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 |
+0.6503 |
+0.817 |
| 1988-04-03 |
1988-08-12 |
-0.1025 |
-0.061 |
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) |
| 2026-02-03 00:00 |
13:45:19.19 |
-57:02:54.6 |
HIP 67237 |
16.43 |
| 2026-02-03 12:00 |
13:45:18.28 |
-57:03:13.9 |
HIP 67237 |
16.75 |
| 2026-02-04 00:00 |
13:45:17.35 |
-57:03:33.0 |
HIP 67237 |
17.07 |
| 2026-02-04 12:00 |
13:45:16.39 |
-57:03:52.0 |
HIP 67237 |
17.39 |
| 2026-02-05 00:00 |
13:45:15.40 |
-57:04:10.9 |
HIP 67237 |
17.72 |
| 2026-02-05 12:00 |
13:45:14.38 |
-57:04:29.7 |
HIP 67237 |
18.04 |
| 2026-02-06 00:00 |
13:45:13.33 |
-57:04:48.4 |
HIP 67237 |
18.37 |
| 2026-02-06 12:00 |
13:45:12.26 |
-57:05:06.9 |
HIP 67237 |
18.70 |
| 2026-02-07 00:00 |
13:45:11.15 |
-57:05:25.4 |
HIP 67237 |
19.03 |
| 2026-02-07 12:00 |
13:45:10.02 |
-57:05:43.7 |
HIP 67237 |
19.36 |
| 2026-02-08 00:00 |
13:45:08.86 |
-57:06:01.9 |
HIP 67237 |
19.70 |
| 2026-02-08 12:00 |
13:45:07.67 |
-57:06:20.0 |
HIP 67237 |
20.03 |
| 2026-02-09 00:00 |
13:45:06.45 |
-57:06:38.0 |
HIP 67237 |
20.37 |
| 2026-02-09 12:00 |
13:45:05.21 |
-57:06:55.8 |
HIP 67237 |
20.70 |
| 2026-02-10 00:00 |
13:45:03.93 |
-57:07:13.5 |
HIP 67237 |
21.04 |
| 2026-02-10 12:00 |
13:45:02.63 |
-57:07:31.1 |
HIP 67237 |
21.38 |
| 2026-02-11 00:00 |
13:45:01.30 |
-57:07:48.5 |
HIP 67237 |
21.72 |
| 2026-02-11 12:00 |
13:44:59.95 |
-57:08:05.9 |
HIP 67237 |
22.06 |
| 2026-02-12 00:00 |
13:44:58.56 |
-57:08:23.1 |
HIP 67237 |
22.40 |
| 2026-02-12 12:00 |
13:44:57.15 |
-57:08:40.1 |
HIP 67237 |
22.74 |
| 2026-02-13 00:00 |
13:44:55.71 |
-57:08:57.0 |
HIP 67237 |
23.08 |
| 2026-02-13 12:00 |
13:44:54.24 |
-57:09:13.8 |
HIP 67237 |
23.42 |
| 2026-02-14 00:00 |
13:44:52.75 |
-57:09:30.5 |
HIP 67237 |
23.77 |
| 2026-02-14 12:00 |
13:44:51.23 |
-57:09:47.0 |
HIP 67237 |
24.11 |
| 2026-02-15 00:00 |
13:44:49.68 |
-57:10:03.3 |
HIP 67237 |
24.45 |
| 2026-02-15 12:00 |
13:44:48.10 |
-57:10:19.6 |
HIP 67237 |
24.80 |
| 2026-02-16 00:00 |
13:44:46.50 |
-57:10:35.7 |
HIP 67237 |
25.14 |
| 2026-02-16 12:00 |
13:44:44.87 |
-57:10:51.6 |
HIP 67237 |
25.49 |
| 2026-02-17 00:00 |
13:44:43.22 |
-57:11:07.4 |
HIP 67237 |
25.84 |
| 2026-02-17 12:00 |
13:44:41.54 |
-57:11:23.0 |
HIP 66975 |
25.57 |
| 2026-02-18 00:00 |
13:44:39.83 |
-57:11:38.5 |
HIP 66975 |
25.25 |
| 2026-02-18 12:00 |
13:44:38.09 |
-57:11:53.9 |
HIP 66975 |
24.93 |
| 2026-02-19 00:00 |
13:44:36.33 |
-57:12:09.1 |
HIP 66975 |
24.61 |
| 2026-02-19 12:00 |
13:44:34.55 |
-57:12:24.1 |
HIP 66975 |
24.30 |
| 2026-02-20 00:00 |
13:44:32.73 |
-57:12:39.0 |
HIP 66975 |
23.98 |
| 2026-02-20 12:00 |
13:44:30.90 |
-57:12:53.8 |
HIP 66975 |
23.67 |
| 2026-02-21 00:00 |
13:44:29.03 |
-57:13:08.3 |
HIP 66975 |
23.36 |
| 2026-02-21 12:00 |
13:44:27.14 |
-57:13:22.8 |
HIP 66975 |
23.06 |
| 2026-02-22 00:00 |
13:44:25.23 |
-57:13:37.0 |
HIP 66975 |
22.75 |
| 2026-02-22 12:00 |
13:44:23.29 |
-57:13:51.1 |
HIP 66975 |
22.45 |
| 2026-02-23 00:00 |
13:44:21.33 |
-57:14:05.1 |
HIP 66975 |
22.16 |
| 2026-02-23 12:00 |
13:44:19.34 |
-57:14:18.9 |
HIP 66975 |
21.86 |
| 2026-02-24 00:00 |
13:44:17.33 |
-57:14:32.5 |
HIP 66975 |
21.57 |