C/2012 Y1 (LINEAR)
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) |
| 2026-02-03 00:00 |
17:09:03.42 |
-04:36:48.9 |
HIP 83837 |
22.97 |
| 2026-02-03 12:00 |
17:09:06.25 |
-04:36:34.4 |
HIP 83837 |
23.27 |
| 2026-02-04 00:00 |
17:09:09.05 |
-04:36:19.7 |
HIP 83837 |
23.58 |
| 2026-02-04 12:00 |
17:09:11.81 |
-04:36:04.9 |
HIP 83837 |
23.91 |
| 2026-02-05 00:00 |
17:09:14.54 |
-04:35:50.0 |
HIP 83837 |
24.24 |
| 2026-02-05 12:00 |
17:09:17.25 |
-04:35:34.9 |
HIP 83837 |
24.58 |
| 2026-02-06 00:00 |
17:09:19.92 |
-04:35:19.7 |
HIP 83837 |
24.93 |
| 2026-02-06 12:00 |
17:09:22.56 |
-04:35:04.3 |
HIP 83837 |
25.29 |
| 2026-02-07 00:00 |
17:09:25.16 |
-04:34:48.8 |
HIP 83837 |
25.66 |
| 2026-02-07 12:00 |
17:09:27.74 |
-04:34:33.2 |
HIP 83837 |
26.03 |
| 2026-02-08 00:00 |
17:09:30.28 |
-04:34:17.4 |
HIP 83837 |
26.40 |
| 2026-02-08 12:00 |
17:09:32.79 |
-04:34:01.4 |
HIP 83837 |
26.78 |
| 2026-02-09 00:00 |
17:09:35.26 |
-04:33:45.4 |
HIP 83837 |
27.17 |
| 2026-02-09 12:00 |
17:09:37.71 |
-04:33:29.2 |
HIP 83837 |
27.55 |
| 2026-02-10 00:00 |
17:09:40.12 |
-04:33:12.8 |
HIP 83837 |
27.94 |
| 2026-02-10 12:00 |
17:09:42.49 |
-04:32:56.3 |
HIP 83837 |
28.33 |
| 2026-02-11 00:00 |
17:09:44.84 |
-04:32:39.7 |
HIP 83837 |
28.72 |
| 2026-02-11 12:00 |
17:09:47.15 |
-04:32:23.0 |
HIP 83837 |
29.12 |
| 2026-02-12 00:00 |
17:09:49.42 |
-04:32:06.1 |
HIP 84110 |
29.09 |
| 2026-02-12 12:00 |
17:09:51.67 |
-04:31:49.1 |
HIP 84110 |
28.61 |
| 2026-02-13 00:00 |
17:09:53.87 |
-04:31:31.9 |
HIP 84110 |
28.14 |
| 2026-02-13 12:00 |
17:09:56.05 |
-04:31:14.6 |
HIP 84110 |
27.69 |
| 2026-02-14 00:00 |
17:09:58.18 |
-04:30:57.2 |
HIP 84110 |
27.25 |
| 2026-02-14 12:00 |
17:10:00.29 |
-04:30:39.7 |
HIP 84110 |
26.83 |
| 2026-02-15 00:00 |
17:10:02.36 |
-04:30:22.1 |
HIP 84110 |
26.43 |
| 2026-02-15 12:00 |
17:10:04.39 |
-04:30:04.3 |
HIP 84110 |
26.04 |
| 2026-02-16 00:00 |
17:10:06.39 |
-04:29:46.4 |
HIP 84110 |
25.67 |
| 2026-02-16 12:00 |
17:10:08.35 |
-04:29:28.4 |
HIP 84110 |
25.31 |
| 2026-02-17 00:00 |
17:10:10.28 |
-04:29:10.2 |
HIP 84110 |
24.98 |
| 2026-02-17 12:00 |
17:10:12.17 |
-04:28:52.0 |
HIP 84110 |
24.66 |
| 2026-02-18 00:00 |
17:10:14.03 |
-04:28:33.6 |
HIP 84110 |
24.35 |
| 2026-02-18 12:00 |
17:10:15.85 |
-04:28:15.1 |
HIP 84110 |
24.07 |
| 2026-02-19 00:00 |
17:10:17.64 |
-04:27:56.5 |
HIP 84110 |
23.80 |
| 2026-02-19 12:00 |
17:10:19.38 |
-04:27:37.8 |
HIP 84110 |
23.55 |
| 2026-02-20 00:00 |
17:10:21.10 |
-04:27:19.0 |
HIP 84110 |
23.32 |
| 2026-02-20 12:00 |
17:10:22.77 |
-04:27:00.0 |
HIP 84110 |
23.11 |
| 2026-02-21 00:00 |
17:10:24.41 |
-04:26:41.0 |
HIP 84110 |
22.92 |
| 2026-02-21 12:00 |
17:10:26.01 |
-04:26:21.9 |
HIP 84110 |
22.74 |
| 2026-02-22 00:00 |
17:10:27.58 |
-04:26:02.6 |
HIP 84110 |
22.59 |
| 2026-02-22 12:00 |
17:10:29.11 |
-04:25:43.2 |
HIP 84110 |
22.45 |
| 2026-02-23 00:00 |
17:10:30.60 |
-04:25:23.8 |
HIP 84110 |
22.33 |
| 2026-02-23 12:00 |
17:10:32.05 |
-04:25:04.2 |
HIP 84110 |
22.23 |
| 2026-02-24 00:00 |
17:10:33.47 |
-04:24:44.6 |
HIP 84110 |
22.15 |