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) |
| 2026-05-12 00:00 |
17:07:00.18 |
-03:30:57.7 |
HIP 83906 |
36.03 |
| 2026-05-12 12:00 |
17:06:56.50 |
-03:30:42.0 |
HIP 83906 |
36.91 |
| 2026-05-13 00:00 |
17:06:52.81 |
-03:30:26.5 |
HIP 83906 |
37.81 |
| 2026-05-13 12:00 |
17:06:49.11 |
-03:30:11.1 |
HIP 83770 |
38.70 |
| 2026-05-14 00:00 |
17:06:45.38 |
-03:29:55.9 |
HIP 83770 |
38.61 |
| 2026-05-14 12:00 |
17:06:41.64 |
-03:29:40.8 |
HIP 83770 |
38.55 |
| 2026-05-15 00:00 |
17:06:37.88 |
-03:29:25.8 |
HIP 83770 |
38.52 |
| 2026-05-15 12:00 |
17:06:34.11 |
-03:29:11.1 |
HIP 83770 |
38.51 |
| 2026-05-16 00:00 |
17:06:30.32 |
-03:28:56.4 |
HIP 83770 |
38.54 |
| 2026-05-16 12:00 |
17:06:26.52 |
-03:28:42.0 |
HIP 83770 |
38.59 |
| 2026-05-17 00:00 |
17:06:22.70 |
-03:28:27.6 |
HIP 83770 |
38.67 |
| 2026-05-17 12:00 |
17:06:18.86 |
-03:28:13.5 |
HIP 83770 |
38.78 |
| 2026-05-18 00:00 |
17:06:15.01 |
-03:27:59.5 |
HIP 83770 |
38.92 |
| 2026-05-18 12:00 |
17:06:11.15 |
-03:27:45.6 |
HIP 83770 |
39.08 |
| 2026-05-19 00:00 |
17:06:07.27 |
-03:27:31.9 |
HIP 83770 |
39.28 |
| 2026-05-19 12:00 |
17:06:03.39 |
-03:27:18.4 |
HIP 83770 |
39.50 |
| 2026-05-20 00:00 |
17:05:59.48 |
-03:27:05.1 |
HIP 83770 |
39.75 |
| 2026-05-20 12:00 |
17:05:55.57 |
-03:26:51.9 |
HIP 83770 |
40.02 |
| 2026-05-21 00:00 |
17:05:51.64 |
-03:26:38.9 |
HIP 83770 |
40.33 |
| 2026-05-21 12:00 |
17:05:47.70 |
-03:26:26.0 |
HIP 83770 |
40.66 |
| 2026-05-22 00:00 |
17:05:43.75 |
-03:26:13.3 |
HIP 83770 |
41.02 |
| 2026-05-22 12:00 |
17:05:39.79 |
-03:26:00.8 |
HIP 83770 |
41.40 |
| 2026-05-23 00:00 |
17:05:35.82 |
-03:25:48.4 |
HIP 83770 |
41.80 |
| 2026-05-23 12:00 |
17:05:31.84 |
-03:25:36.2 |
HIP 83770 |
42.23 |
| 2026-05-24 00:00 |
17:05:27.85 |
-03:25:24.2 |
HIP 83770 |
42.69 |
| 2026-05-24 12:00 |
17:05:23.85 |
-03:25:12.3 |
HIP 83770 |
43.17 |
| 2026-05-25 00:00 |
17:05:19.84 |
-03:25:00.7 |
HIP 83770 |
43.66 |
| 2026-05-25 12:00 |
17:05:15.82 |
-03:24:49.1 |
HIP 83770 |
44.19 |
| 2026-05-26 00:00 |
17:05:11.79 |
-03:24:37.8 |
HIP 83770 |
44.73 |
| 2026-05-26 12:00 |
17:05:07.75 |
-03:24:26.6 |
HIP 83770 |
45.29 |
| 2026-05-27 00:00 |
17:05:03.71 |
-03:24:15.7 |
HIP 83770 |
45.87 |
| 2026-05-27 12:00 |
17:04:59.66 |
-03:24:04.8 |
HIP 83770 |
46.47 |
| 2026-05-28 00:00 |
17:04:55.60 |
-03:23:54.2 |
HIP 83770 |
47.09 |
| 2026-05-28 12:00 |
17:04:51.53 |
-03:23:43.7 |
HIP 83770 |
47.72 |
| 2026-05-29 00:00 |
17:04:47.46 |
-03:23:33.4 |
HIP 83770 |
48.38 |
| 2026-05-29 12:00 |
17:04:43.38 |
-03:23:23.3 |
HIP 83770 |
49.04 |
| 2026-05-30 00:00 |
17:04:39.30 |
-03:23:13.4 |
HIP 83510 |
49.12 |
| 2026-05-30 12:00 |
17:04:35.21 |
-03:23:03.6 |
HIP 83510 |
48.78 |
| 2026-05-31 00:00 |
17:04:31.11 |
-03:22:54.1 |
HIP 83510 |
48.45 |
| 2026-05-31 12:00 |
17:04:27.01 |
-03:22:44.7 |
HIP 83510 |
48.15 |
| 2026-06-01 00:00 |
17:04:22.90 |
-03:22:35.5 |
HIP 83510 |
47.87 |
| 2026-06-01 12:00 |
17:04:18.79 |
-03:22:26.4 |
HIP 83510 |
47.61 |
| 2026-06-02 00:00 |
17:04:14.68 |
-03:22:17.6 |
HIP 83510 |
47.38 |