メタデータ
| 項目 |
値 |
| Designation |
C/2012 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-01-18T04:43:29.334720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:29Z |
| Obs used |
139 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-01-17.0000000 |
| e |
0.94686433 |
| q (au) |
2.016201 |
| a (au) |
37.944395 |
| i (deg) |
20.959420 |
| Ω (om, deg) |
193.245089 |
| ω (w, deg) |
268.830766 |
| M (ma, deg) |
359.994953 |
等級
散乱 + 全体線形
$$
M_a = (15.253 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.253 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.501 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
17:10:48.93 |
-04:02:59.8 |
HIP 83906 |
30.24 |
| 2026-03-26 12:00 |
17:10:48.02 |
-04:02:37.0 |
HIP 83906 |
29.90 |
| 2026-03-27 00:00 |
17:10:47.07 |
-04:02:14.2 |
HIP 83906 |
29.56 |
| 2026-03-27 12:00 |
17:10:46.09 |
-04:01:51.3 |
HIP 83906 |
29.21 |
| 2026-03-28 00:00 |
17:10:45.07 |
-04:01:28.5 |
HIP 83906 |
28.85 |
| 2026-03-28 12:00 |
17:10:44.01 |
-04:01:05.7 |
HIP 83906 |
28.49 |
| 2026-03-29 00:00 |
17:10:42.91 |
-04:00:42.9 |
HIP 83906 |
28.12 |
| 2026-03-29 12:00 |
17:10:41.78 |
-04:00:20.1 |
HIP 83906 |
27.74 |
| 2026-03-30 00:00 |
17:10:40.61 |
-03:59:57.3 |
HIP 83906 |
27.36 |
| 2026-03-30 12:00 |
17:10:39.40 |
-03:59:34.6 |
HIP 83906 |
26.98 |
| 2026-03-31 00:00 |
17:10:38.16 |
-03:59:11.8 |
HIP 83906 |
26.58 |
| 2026-03-31 12:00 |
17:10:36.88 |
-03:58:49.1 |
HIP 83906 |
26.19 |
| 2026-04-01 00:00 |
17:10:35.56 |
-03:58:26.3 |
HIP 83906 |
25.78 |
| 2026-04-01 12:00 |
17:10:34.21 |
-03:58:03.6 |
HIP 83906 |
25.37 |
| 2026-04-02 00:00 |
17:10:32.82 |
-03:57:41.0 |
HIP 83906 |
24.96 |
| 2026-04-02 12:00 |
17:10:31.40 |
-03:57:18.3 |
HIP 83906 |
24.54 |
| 2026-04-03 00:00 |
17:10:29.94 |
-03:56:55.7 |
HIP 83906 |
24.12 |
| 2026-04-03 12:00 |
17:10:28.44 |
-03:56:33.0 |
HIP 83906 |
23.69 |
| 2026-04-04 00:00 |
17:10:26.91 |
-03:56:10.4 |
HIP 83906 |
23.26 |
| 2026-04-04 12:00 |
17:10:25.35 |
-03:55:47.9 |
HIP 83906 |
22.82 |
| 2026-04-05 00:00 |
17:10:23.74 |
-03:55:25.4 |
HIP 83906 |
22.38 |
| 2026-04-05 12:00 |
17:10:22.11 |
-03:55:02.9 |
HIP 83906 |
21.94 |
| 2026-04-06 00:00 |
17:10:20.44 |
-03:54:40.4 |
HIP 83906 |
21.49 |
| 2026-04-06 12:00 |
17:10:18.73 |
-03:54:17.9 |
HIP 83906 |
21.04 |
| 2026-04-07 00:00 |
17:10:16.99 |
-03:53:55.6 |
HIP 83906 |
20.58 |
| 2026-04-07 12:00 |
17:10:15.21 |
-03:53:33.2 |
HIP 83906 |
20.13 |
| 2026-04-08 00:00 |
17:10:13.40 |
-03:53:10.9 |
HIP 83906 |
19.67 |
| 2026-04-08 12:00 |
17:10:11.55 |
-03:52:48.6 |
HIP 83906 |
19.21 |
| 2026-04-09 00:00 |
17:10:09.67 |
-03:52:26.4 |
HIP 83906 |
18.74 |
| 2026-04-09 12:00 |
17:10:07.76 |
-03:52:04.2 |
HIP 83906 |
18.28 |
| 2026-04-10 00:00 |
17:10:05.81 |
-03:51:42.0 |
HIP 83906 |
17.82 |
| 2026-04-10 12:00 |
17:10:03.83 |
-03:51:19.9 |
HIP 83906 |
17.36 |
| 2026-04-11 00:00 |
17:10:01.82 |
-03:50:57.9 |
HIP 83906 |
16.90 |
| 2026-04-11 12:00 |
17:09:59.77 |
-03:50:35.9 |
HIP 83906 |
16.44 |
| 2026-04-12 00:00 |
17:09:57.69 |
-03:50:13.9 |
HIP 83906 |
15.98 |
| 2026-04-12 12:00 |
17:09:55.57 |
-03:49:52.0 |
HIP 83906 |
15.53 |
| 2026-04-13 00:00 |
17:09:53.42 |
-03:49:30.2 |
HIP 83906 |
15.08 |
| 2026-04-13 12:00 |
17:09:51.24 |
-03:49:08.4 |
HIP 83906 |
14.65 |
| 2026-04-14 00:00 |
17:09:49.03 |
-03:48:46.7 |
HIP 83906 |
14.22 |
| 2026-04-14 12:00 |
17:09:46.78 |
-03:48:25.1 |
HIP 83906 |
13.80 |
| 2026-04-15 00:00 |
17:09:44.50 |
-03:48:03.5 |
HIP 83906 |
13.39 |
| 2026-04-15 12:00 |
17:09:42.19 |
-03:47:42.0 |
HIP 83906 |
12.99 |
| 2026-04-16 00:00 |
17:09:39.85 |
-03:47:20.5 |
HIP 83906 |
12.62 |