メタデータ
| 項目 |
値 |
| Designation |
C/2007 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-03-19T08:29:13.778880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:15Z |
| Obs used |
204 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-01-29.0000000 |
| e |
1.00073266 |
| q (au) |
3.340909 |
| a (au) |
-4559.959890 |
| i (deg) |
110.178645 |
| Ω (om, deg) |
133.091647 |
| ω (w, deg) |
357.132366 |
| M (ma, deg) |
-0.000161 |
等級
散乱 + 全体線形
$$
M_a = (15.434 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.434 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.683 |
| k |
0.800 |
| 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 |
21:16:54.14 |
+21:14:39.6 |
HIP 104992 |
14.78 |
| 2026-03-26 12:00 |
21:16:56.36 |
+21:15:05.9 |
HIP 104992 |
15.21 |
| 2026-03-27 00:00 |
21:16:58.57 |
+21:15:32.3 |
HIP 104992 |
15.64 |
| 2026-03-27 12:00 |
21:17:00.75 |
+21:15:58.8 |
HIP 104992 |
16.09 |
| 2026-03-28 00:00 |
21:17:02.91 |
+21:16:25.3 |
HIP 104992 |
16.55 |
| 2026-03-28 12:00 |
21:17:05.05 |
+21:16:52.0 |
HIP 104992 |
17.01 |
| 2026-03-29 00:00 |
21:17:07.16 |
+21:17:18.7 |
HIP 104992 |
17.48 |
| 2026-03-29 12:00 |
21:17:09.26 |
+21:17:45.6 |
HIP 104992 |
17.97 |
| 2026-03-30 00:00 |
21:17:11.33 |
+21:18:12.5 |
HIP 104992 |
18.45 |
| 2026-03-30 12:00 |
21:17:13.38 |
+21:18:39.4 |
HIP 104992 |
18.94 |
| 2026-03-31 00:00 |
21:17:15.41 |
+21:19:06.5 |
HIP 104992 |
19.44 |
| 2026-03-31 12:00 |
21:17:17.42 |
+21:19:33.6 |
HIP 105209 |
19.45 |
| 2026-04-01 00:00 |
21:17:19.40 |
+21:20:00.8 |
HIP 105209 |
19.04 |
| 2026-04-01 12:00 |
21:17:21.36 |
+21:20:28.1 |
HIP 105209 |
18.64 |
| 2026-04-02 00:00 |
21:17:23.30 |
+21:20:55.4 |
HIP 105209 |
18.27 |
| 2026-04-02 12:00 |
21:17:25.22 |
+21:21:22.8 |
HIP 105209 |
17.92 |
| 2026-04-03 00:00 |
21:17:27.11 |
+21:21:50.3 |
HIP 105209 |
17.58 |
| 2026-04-03 12:00 |
21:17:28.98 |
+21:22:17.8 |
HIP 105209 |
17.27 |
| 2026-04-04 00:00 |
21:17:30.82 |
+21:22:45.4 |
HIP 105209 |
16.99 |
| 2026-04-04 12:00 |
21:17:32.64 |
+21:23:13.1 |
HIP 105209 |
16.73 |
| 2026-04-05 00:00 |
21:17:34.44 |
+21:23:40.8 |
HIP 105209 |
16.49 |
| 2026-04-05 12:00 |
21:17:36.22 |
+21:24:08.5 |
HIP 105209 |
16.28 |
| 2026-04-06 00:00 |
21:17:37.97 |
+21:24:36.3 |
HIP 105209 |
16.10 |
| 2026-04-06 12:00 |
21:17:39.69 |
+21:25:04.2 |
HIP 105209 |
15.94 |
| 2026-04-07 00:00 |
21:17:41.40 |
+21:25:32.1 |
HIP 105209 |
15.81 |
| 2026-04-07 12:00 |
21:17:43.07 |
+21:26:00.0 |
HIP 105209 |
15.71 |
| 2026-04-08 00:00 |
21:17:44.73 |
+21:26:28.0 |
HIP 105209 |
15.63 |
| 2026-04-08 12:00 |
21:17:46.36 |
+21:26:56.0 |
HIP 105209 |
15.59 |
| 2026-04-09 00:00 |
21:17:47.96 |
+21:27:24.1 |
HIP 105209 |
15.57 |
| 2026-04-09 12:00 |
21:17:49.54 |
+21:27:52.2 |
HIP 105209 |
15.58 |
| 2026-04-10 00:00 |
21:17:51.10 |
+21:28:20.4 |
HIP 105209 |
15.62 |
| 2026-04-10 12:00 |
21:17:52.63 |
+21:28:48.5 |
HIP 105209 |
15.69 |
| 2026-04-11 00:00 |
21:17:54.13 |
+21:29:16.7 |
HIP 105209 |
15.78 |
| 2026-04-11 12:00 |
21:17:55.61 |
+21:29:45.0 |
HIP 105209 |
15.90 |
| 2026-04-12 00:00 |
21:17:57.06 |
+21:30:13.2 |
HIP 105209 |
16.04 |
| 2026-04-12 12:00 |
21:17:58.49 |
+21:30:41.5 |
HIP 105209 |
16.20 |
| 2026-04-13 00:00 |
21:17:59.89 |
+21:31:09.8 |
HIP 105209 |
16.39 |
| 2026-04-13 12:00 |
21:18:01.27 |
+21:31:38.1 |
HIP 105209 |
16.60 |
| 2026-04-14 00:00 |
21:18:02.62 |
+21:32:06.4 |
HIP 105209 |
16.83 |
| 2026-04-14 12:00 |
21:18:03.95 |
+21:32:34.8 |
HIP 105209 |
17.07 |
| 2026-04-15 00:00 |
21:18:05.25 |
+21:33:03.1 |
HIP 105209 |
17.34 |
| 2026-04-15 12:00 |
21:18:06.52 |
+21:33:31.5 |
HIP 105209 |
17.62 |
| 2026-04-16 00:00 |
21:18:07.77 |
+21:33:59.9 |
HIP 105209 |
17.92 |