メタデータ
| 項目 |
値 |
| Designation |
C/2002 A1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-11-27T13:19:30.161280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:12Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2002-06-06.0000000 |
| e |
0.72578378 |
| q (au) |
4.710957 |
| a (au) |
17.179715 |
| i (deg) |
14.057508 |
| Ω (om, deg) |
81.807737 |
| ω (w, deg) |
18.909060 |
| M (ma, deg) |
2.636023 |
等級
散乱 + 全体線形
$$
M_a = (9.195 + 3.997\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.195 |
| n |
3.997 |
| gf |
0.913 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
3.685 |
| 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) |
| 2026-07-29 00:00 |
17:50:20.22 |
-25:30:54.9 |
HIP 87422 |
26.38 |
| 2026-07-29 12:00 |
17:50:16.80 |
-25:30:54.3 |
HIP 87422 |
27.01 |
| 2026-07-30 00:00 |
17:50:13.41 |
-25:30:53.8 |
HIP 87422 |
27.65 |
| 2026-07-30 12:00 |
17:50:10.05 |
-25:30:53.2 |
HIP 87422 |
28.28 |
| 2026-07-31 00:00 |
17:50:06.72 |
-25:30:52.6 |
HIP 87422 |
28.92 |
| 2026-07-31 12:00 |
17:50:03.41 |
-25:30:52.0 |
HIP 87422 |
29.56 |
| 2026-08-01 00:00 |
17:50:00.13 |
-25:30:51.4 |
HIP 87422 |
30.19 |
| 2026-08-01 12:00 |
17:49:56.89 |
-25:30:50.7 |
HIP 87422 |
30.83 |
| 2026-08-02 00:00 |
17:49:53.67 |
-25:30:50.1 |
HIP 87422 |
31.46 |
| 2026-08-02 12:00 |
17:49:50.48 |
-25:30:49.4 |
HIP 87422 |
32.10 |
| 2026-08-03 00:00 |
17:49:47.32 |
-25:30:48.8 |
HIP 87422 |
32.73 |
| 2026-08-03 12:00 |
17:49:44.19 |
-25:30:48.1 |
HIP 87422 |
33.35 |
| 2026-08-04 00:00 |
17:49:41.09 |
-25:30:47.4 |
HIP 87093 |
32.88 |
| 2026-08-04 12:00 |
17:49:38.03 |
-25:30:46.7 |
HIP 87093 |
32.32 |
| 2026-08-05 00:00 |
17:49:34.99 |
-25:30:46.0 |
HIP 87093 |
31.77 |
| 2026-08-05 12:00 |
17:49:31.99 |
-25:30:45.2 |
HIP 87093 |
31.22 |
| 2026-08-06 00:00 |
17:49:29.01 |
-25:30:44.5 |
HIP 87093 |
30.69 |
| 2026-08-06 12:00 |
17:49:26.07 |
-25:30:43.8 |
HIP 87093 |
30.17 |
| 2026-08-07 00:00 |
17:49:23.16 |
-25:30:43.0 |
HIP 87093 |
29.66 |
| 2026-08-07 12:00 |
17:49:20.29 |
-25:30:42.2 |
HIP 87093 |
29.17 |
| 2026-08-08 00:00 |
17:49:17.44 |
-25:30:41.4 |
HIP 87093 |
28.68 |
| 2026-08-08 12:00 |
17:49:14.63 |
-25:30:40.7 |
HIP 87093 |
28.21 |
| 2026-08-09 00:00 |
17:49:11.85 |
-25:30:39.9 |
HIP 87093 |
27.74 |
| 2026-08-09 12:00 |
17:49:09.11 |
-25:30:39.1 |
HIP 87093 |
27.29 |
| 2026-08-10 00:00 |
17:49:06.40 |
-25:30:38.2 |
HIP 87093 |
26.86 |
| 2026-08-10 12:00 |
17:49:03.72 |
-25:30:37.4 |
HIP 87093 |
26.43 |
| 2026-08-11 00:00 |
17:49:01.08 |
-25:30:36.6 |
HIP 87093 |
26.01 |
| 2026-08-11 12:00 |
17:48:58.47 |
-25:30:35.8 |
HIP 87093 |
25.61 |
| 2026-08-12 00:00 |
17:48:55.90 |
-25:30:34.9 |
HIP 87093 |
25.22 |
| 2026-08-12 12:00 |
17:48:53.36 |
-25:30:34.1 |
HIP 87093 |
24.84 |
| 2026-08-13 00:00 |
17:48:50.85 |
-25:30:33.2 |
HIP 87093 |
24.48 |
| 2026-08-13 12:00 |
17:48:48.38 |
-25:30:32.3 |
HIP 87093 |
24.13 |
| 2026-08-14 00:00 |
17:48:45.95 |
-25:30:31.5 |
HIP 87093 |
23.79 |
| 2026-08-14 12:00 |
17:48:43.56 |
-25:30:30.6 |
HIP 87093 |
23.46 |
| 2026-08-15 00:00 |
17:48:41.19 |
-25:30:29.7 |
HIP 87093 |
23.14 |
| 2026-08-15 12:00 |
17:48:38.87 |
-25:30:28.8 |
HIP 87093 |
22.84 |
| 2026-08-16 00:00 |
17:48:36.58 |
-25:30:28.0 |
HIP 87093 |
22.55 |
| 2026-08-16 12:00 |
17:48:34.33 |
-25:30:27.1 |
HIP 87093 |
22.27 |
| 2026-08-17 00:00 |
17:48:32.12 |
-25:30:26.2 |
HIP 87093 |
22.01 |
| 2026-08-17 12:00 |
17:48:29.94 |
-25:30:25.3 |
HIP 87093 |
21.75 |
| 2026-08-18 00:00 |
17:48:27.80 |
-25:30:24.4 |
HIP 87093 |
21.51 |
| 2026-08-18 12:00 |
17:48:25.69 |
-25:30:23.4 |
HIP 87093 |
21.28 |
| 2026-08-19 00:00 |
17:48:23.63 |
-25:30:22.5 |
HIP 87093 |
21.07 |