メタデータ
| 項目 |
値 |
| Designation |
C/2001 A1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-09-17T14:53:00.830400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
6.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2001-02-04.0000000 |
| e |
0.99093655 |
| q (au) |
2.406447 |
| a (au) |
265.511207 |
| i (deg) |
59.940739 |
| Ω (om, deg) |
339.594496 |
| ω (w, deg) |
107.889040 |
| M (ma, deg) |
0.031753 |
等級
散乱 + 全体線形
$$
M_a = (12.703 + 3.720\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.703 |
| n |
3.720 |
| gf |
1.000 |
| gb |
-0.555 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
12:22:59.37 |
-73:29:33.1 |
HIP 60334 |
3.22 |
| 2026-05-12 12:00 |
12:22:53.55 |
-73:29:05.4 |
HIP 60334 |
2.96 |
| 2026-05-13 00:00 |
12:22:47.78 |
-73:28:37.5 |
HIP 60334 |
2.82 |
| 2026-05-13 12:00 |
12:22:42.08 |
-73:28:09.4 |
HIP 60334 |
2.82 |
| 2026-05-14 00:00 |
12:22:36.43 |
-73:27:41.1 |
HIP 60334 |
2.96 |
| 2026-05-14 12:00 |
12:22:30.83 |
-73:27:12.6 |
HIP 60334 |
3.21 |
| 2026-05-15 00:00 |
12:22:25.30 |
-73:26:43.9 |
HIP 60334 |
3.56 |
| 2026-05-15 12:00 |
12:22:19.82 |
-73:26:15.0 |
HIP 60334 |
3.98 |
| 2026-05-16 00:00 |
12:22:14.40 |
-73:25:46.0 |
HIP 60334 |
4.45 |
| 2026-05-16 12:00 |
12:22:09.04 |
-73:25:16.7 |
HIP 60334 |
4.96 |
| 2026-05-17 00:00 |
12:22:03.74 |
-73:24:47.3 |
HIP 60334 |
5.49 |
| 2026-05-17 12:00 |
12:21:58.50 |
-73:24:17.7 |
HIP 60334 |
6.04 |
| 2026-05-18 00:00 |
12:21:53.32 |
-73:23:48.0 |
HIP 60334 |
6.61 |
| 2026-05-18 12:00 |
12:21:48.21 |
-73:23:18.0 |
HIP 60334 |
7.18 |
| 2026-05-19 00:00 |
12:21:43.15 |
-73:22:47.9 |
HIP 60334 |
7.76 |
| 2026-05-19 12:00 |
12:21:38.15 |
-73:22:17.6 |
HIP 60334 |
8.35 |
| 2026-05-20 00:00 |
12:21:33.22 |
-73:21:47.2 |
HIP 60334 |
8.95 |
| 2026-05-20 12:00 |
12:21:28.35 |
-73:21:16.6 |
HIP 60334 |
9.54 |
| 2026-05-21 00:00 |
12:21:23.54 |
-73:20:45.9 |
HIP 60334 |
10.15 |
| 2026-05-21 12:00 |
12:21:18.79 |
-73:20:15.0 |
HIP 60334 |
10.75 |
| 2026-05-22 00:00 |
12:21:14.11 |
-73:19:43.9 |
HIP 60334 |
11.36 |
| 2026-05-22 12:00 |
12:21:09.49 |
-73:19:12.7 |
HIP 60334 |
11.96 |
| 2026-05-23 00:00 |
12:21:04.93 |
-73:18:41.3 |
HIP 60334 |
12.57 |
| 2026-05-23 12:00 |
12:21:00.44 |
-73:18:09.9 |
HIP 60334 |
13.18 |
| 2026-05-24 00:00 |
12:20:56.01 |
-73:17:38.2 |
HIP 60334 |
13.79 |
| 2026-05-24 12:00 |
12:20:51.64 |
-73:17:06.5 |
HIP 60334 |
14.40 |
| 2026-05-25 00:00 |
12:20:47.34 |
-73:16:34.6 |
HIP 60334 |
15.02 |
| 2026-05-25 12:00 |
12:20:43.10 |
-73:16:02.5 |
HIP 60334 |
15.63 |
| 2026-05-26 00:00 |
12:20:38.93 |
-73:15:30.4 |
HIP 60334 |
16.24 |
| 2026-05-26 12:00 |
12:20:34.82 |
-73:14:58.1 |
HIP 60487 |
16.74 |
| 2026-05-27 00:00 |
12:20:30.78 |
-73:14:25.7 |
HIP 60487 |
16.78 |
| 2026-05-27 12:00 |
12:20:26.80 |
-73:13:53.1 |
HIP 60487 |
16.84 |
| 2026-05-28 00:00 |
12:20:22.89 |
-73:13:20.5 |
HIP 60487 |
16.91 |
| 2026-05-28 12:00 |
12:20:19.04 |
-73:12:47.7 |
HIP 60487 |
17.00 |
| 2026-05-29 00:00 |
12:20:15.26 |
-73:12:14.9 |
HIP 60487 |
17.11 |
| 2026-05-29 12:00 |
12:20:11.54 |
-73:11:41.9 |
HIP 60487 |
17.24 |
| 2026-05-30 00:00 |
12:20:07.89 |
-73:11:08.8 |
HIP 60487 |
17.38 |
| 2026-05-30 12:00 |
12:20:04.30 |
-73:10:35.6 |
HIP 60487 |
17.54 |
| 2026-05-31 00:00 |
12:20:00.79 |
-73:10:02.3 |
HIP 60487 |
17.71 |
| 2026-05-31 12:00 |
12:19:57.33 |
-73:09:28.9 |
HIP 60487 |
17.89 |
| 2026-06-01 00:00 |
12:19:53.95 |
-73:08:55.4 |
HIP 60487 |
18.09 |
| 2026-06-01 12:00 |
12:19:50.63 |
-73:08:21.8 |
HIP 60487 |
18.31 |
| 2026-06-02 00:00 |
12:19:47.38 |
-73:07:48.2 |
HIP 60487 |
18.53 |