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 |
3.686 |
| 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 |
18:01:09.14 |
-25:27:14.8 |
HIP 88292 |
13.39 |
| 2026-05-12 12:00 |
18:01:05.77 |
-25:27:18.2 |
HIP 88292 |
13.84 |
| 2026-05-13 00:00 |
18:01:02.37 |
-25:27:21.6 |
HIP 88292 |
14.33 |
| 2026-05-13 12:00 |
18:00:58.94 |
-25:27:25.0 |
HIP 88292 |
14.84 |
| 2026-05-14 00:00 |
18:00:55.49 |
-25:27:28.4 |
HIP 88292 |
15.38 |
| 2026-05-14 12:00 |
18:00:52.00 |
-25:27:31.7 |
HIP 88292 |
15.95 |
| 2026-05-15 00:00 |
18:00:48.49 |
-25:27:35.1 |
HIP 88292 |
16.53 |
| 2026-05-15 12:00 |
18:00:44.95 |
-25:27:38.4 |
HIP 88292 |
17.14 |
| 2026-05-16 00:00 |
18:00:41.38 |
-25:27:41.7 |
HIP 88292 |
17.78 |
| 2026-05-16 12:00 |
18:00:37.79 |
-25:27:44.9 |
HIP 88292 |
18.43 |
| 2026-05-17 00:00 |
18:00:34.17 |
-25:27:48.2 |
HIP 88292 |
19.09 |
| 2026-05-17 12:00 |
18:00:30.52 |
-25:27:51.4 |
HIP 88292 |
19.78 |
| 2026-05-18 00:00 |
18:00:26.85 |
-25:27:54.6 |
HIP 88292 |
20.48 |
| 2026-05-18 12:00 |
18:00:23.16 |
-25:27:57.8 |
HIP 88292 |
21.19 |
| 2026-05-19 00:00 |
18:00:19.44 |
-25:28:00.9 |
HIP 88292 |
21.92 |
| 2026-05-19 12:00 |
18:00:15.69 |
-25:28:04.1 |
HIP 88292 |
22.66 |
| 2026-05-20 00:00 |
18:00:11.92 |
-25:28:07.2 |
HIP 88049 |
23.04 |
| 2026-05-20 12:00 |
18:00:08.13 |
-25:28:10.3 |
HIP 88049 |
22.50 |
| 2026-05-21 00:00 |
18:00:04.31 |
-25:28:13.4 |
HIP 88049 |
21.98 |
| 2026-05-21 12:00 |
18:00:00.47 |
-25:28:16.4 |
HIP 88049 |
21.47 |
| 2026-05-22 00:00 |
17:59:56.61 |
-25:28:19.5 |
HIP 88049 |
20.98 |
| 2026-05-22 12:00 |
17:59:52.73 |
-25:28:22.5 |
HIP 88049 |
20.52 |
| 2026-05-23 00:00 |
17:59:48.82 |
-25:28:25.4 |
HIP 88049 |
20.08 |
| 2026-05-23 12:00 |
17:59:44.89 |
-25:28:28.4 |
HIP 88049 |
19.67 |
| 2026-05-24 00:00 |
17:59:40.94 |
-25:28:31.3 |
HIP 88049 |
19.29 |
| 2026-05-24 12:00 |
17:59:36.97 |
-25:28:34.2 |
HIP 88049 |
18.94 |
| 2026-05-25 00:00 |
17:59:32.98 |
-25:28:37.1 |
HIP 88049 |
18.62 |
| 2026-05-25 12:00 |
17:59:28.97 |
-25:28:40.0 |
HIP 88049 |
18.35 |
| 2026-05-26 00:00 |
17:59:24.94 |
-25:28:42.8 |
HIP 88049 |
18.11 |
| 2026-05-26 12:00 |
17:59:20.89 |
-25:28:45.6 |
HIP 88049 |
17.91 |
| 2026-05-27 00:00 |
17:59:16.82 |
-25:28:48.4 |
HIP 88049 |
17.76 |
| 2026-05-27 12:00 |
17:59:12.73 |
-25:28:51.1 |
HIP 88049 |
17.65 |
| 2026-05-28 00:00 |
17:59:08.63 |
-25:28:53.9 |
HIP 88049 |
17.59 |
| 2026-05-28 12:00 |
17:59:04.50 |
-25:28:56.6 |
HIP 88049 |
17.58 |
| 2026-05-29 00:00 |
17:59:00.36 |
-25:28:59.2 |
HIP 88049 |
17.62 |
| 2026-05-29 12:00 |
17:58:56.20 |
-25:29:01.9 |
HIP 88049 |
17.70 |
| 2026-05-30 00:00 |
17:58:52.03 |
-25:29:04.5 |
HIP 88049 |
17.84 |
| 2026-05-30 12:00 |
17:58:47.83 |
-25:29:07.1 |
HIP 88049 |
18.03 |
| 2026-05-31 00:00 |
17:58:43.62 |
-25:29:09.7 |
HIP 88049 |
18.26 |
| 2026-05-31 12:00 |
17:58:39.40 |
-25:29:12.2 |
HIP 88049 |
18.54 |
| 2026-06-01 00:00 |
17:58:35.16 |
-25:29:14.7 |
HIP 88049 |
18.86 |
| 2026-06-01 12:00 |
17:58:30.90 |
-25:29:17.2 |
HIP 88049 |
19.23 |
| 2026-06-02 00:00 |
17:58:26.63 |
-25:29:19.7 |
HIP 88049 |
19.64 |