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 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
16:57:24.00 |
-03:26:10.6 |
HIP 82945 |
23.42 |
| 2026-07-29 12:00 |
16:57:21.58 |
-03:26:22.9 |
HIP 82945 |
23.08 |
| 2026-07-30 00:00 |
16:57:19.18 |
-03:26:35.4 |
HIP 82945 |
22.75 |
| 2026-07-30 12:00 |
16:57:16.82 |
-03:26:48.1 |
HIP 82945 |
22.44 |
| 2026-07-31 00:00 |
16:57:14.48 |
-03:27:00.8 |
HIP 82945 |
22.13 |
| 2026-07-31 12:00 |
16:57:12.18 |
-03:27:13.8 |
HIP 82945 |
21.84 |
| 2026-08-01 00:00 |
16:57:09.91 |
-03:27:26.9 |
HIP 82945 |
21.56 |
| 2026-08-01 12:00 |
16:57:07.66 |
-03:27:40.1 |
HIP 82945 |
21.29 |
| 2026-08-02 00:00 |
16:57:05.45 |
-03:27:53.5 |
HIP 82945 |
21.03 |
| 2026-08-02 12:00 |
16:57:03.27 |
-03:28:07.0 |
HIP 82945 |
20.79 |
| 2026-08-03 00:00 |
16:57:01.12 |
-03:28:20.6 |
HIP 82945 |
20.55 |
| 2026-08-03 12:00 |
16:56:59.00 |
-03:28:34.4 |
HIP 82945 |
20.33 |
| 2026-08-04 00:00 |
16:56:56.92 |
-03:28:48.4 |
HIP 82945 |
20.12 |
| 2026-08-04 12:00 |
16:56:54.86 |
-03:29:02.5 |
HIP 82945 |
19.92 |
| 2026-08-05 00:00 |
16:56:52.84 |
-03:29:16.7 |
HIP 82945 |
19.73 |
| 2026-08-05 12:00 |
16:56:50.85 |
-03:29:31.1 |
HIP 82945 |
19.55 |
| 2026-08-06 00:00 |
16:56:48.89 |
-03:29:45.6 |
HIP 82945 |
19.38 |
| 2026-08-06 12:00 |
16:56:46.96 |
-03:30:00.2 |
HIP 82945 |
19.22 |
| 2026-08-07 00:00 |
16:56:45.07 |
-03:30:15.0 |
HIP 82945 |
19.07 |
| 2026-08-07 12:00 |
16:56:43.20 |
-03:30:29.9 |
HIP 82945 |
18.94 |
| 2026-08-08 00:00 |
16:56:41.37 |
-03:30:44.9 |
HIP 82945 |
18.81 |
| 2026-08-08 12:00 |
16:56:39.58 |
-03:31:00.1 |
HIP 82945 |
18.69 |
| 2026-08-09 00:00 |
16:56:37.82 |
-03:31:15.4 |
HIP 82945 |
18.58 |
| 2026-08-09 12:00 |
16:56:36.09 |
-03:31:30.9 |
HIP 82945 |
18.47 |
| 2026-08-10 00:00 |
16:56:34.39 |
-03:31:46.4 |
HIP 82945 |
18.38 |
| 2026-08-10 12:00 |
16:56:32.73 |
-03:32:02.1 |
HIP 82945 |
18.29 |
| 2026-08-11 00:00 |
16:56:31.10 |
-03:32:17.9 |
HIP 82945 |
18.21 |
| 2026-08-11 12:00 |
16:56:29.51 |
-03:32:33.9 |
HIP 82945 |
18.14 |
| 2026-08-12 00:00 |
16:56:27.95 |
-03:32:49.9 |
HIP 82945 |
18.08 |
| 2026-08-12 12:00 |
16:56:26.42 |
-03:33:06.1 |
HIP 82945 |
18.02 |
| 2026-08-13 00:00 |
16:56:24.93 |
-03:33:22.4 |
HIP 82945 |
17.96 |
| 2026-08-13 12:00 |
16:56:23.47 |
-03:33:38.9 |
HIP 82945 |
17.91 |
| 2026-08-14 00:00 |
16:56:22.05 |
-03:33:55.4 |
HIP 82945 |
17.87 |
| 2026-08-14 12:00 |
16:56:20.66 |
-03:34:12.1 |
HIP 82945 |
17.83 |
| 2026-08-15 00:00 |
16:56:19.31 |
-03:34:28.8 |
HIP 82945 |
17.80 |
| 2026-08-15 12:00 |
16:56:17.99 |
-03:34:45.7 |
HIP 82945 |
17.77 |
| 2026-08-16 00:00 |
16:56:16.71 |
-03:35:02.7 |
HIP 82945 |
17.74 |
| 2026-08-16 12:00 |
16:56:15.46 |
-03:35:19.8 |
HIP 82945 |
17.72 |
| 2026-08-17 00:00 |
16:56:14.24 |
-03:35:37.1 |
HIP 82945 |
17.70 |
| 2026-08-17 12:00 |
16:56:13.07 |
-03:35:54.4 |
HIP 82945 |
17.68 |
| 2026-08-18 00:00 |
16:56:11.92 |
-03:36:11.8 |
HIP 82945 |
17.67 |
| 2026-08-18 12:00 |
16:56:10.82 |
-03:36:29.3 |
HIP 82945 |
17.65 |
| 2026-08-19 00:00 |
16:56:09.74 |
-03:36:47.0 |
HIP 82945 |
17.64 |