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) |
| 2026-05-12 00:00 |
21:18:34.69 |
+21:57:48.6 |
HIP 105161 |
10.63 |
| 2026-05-12 12:00 |
21:18:34.46 |
+21:58:14.1 |
HIP 105161 |
10.24 |
| 2026-05-13 00:00 |
21:18:34.21 |
+21:58:39.6 |
HIP 105161 |
9.85 |
| 2026-05-13 12:00 |
21:18:33.92 |
+21:59:04.9 |
HIP 105161 |
9.46 |
| 2026-05-14 00:00 |
21:18:33.60 |
+21:59:30.1 |
HIP 105161 |
9.08 |
| 2026-05-14 12:00 |
21:18:33.26 |
+21:59:55.2 |
HIP 105161 |
8.69 |
| 2026-05-15 00:00 |
21:18:32.89 |
+22:00:20.2 |
HIP 105161 |
8.31 |
| 2026-05-15 12:00 |
21:18:32.48 |
+22:00:45.1 |
HIP 105161 |
7.93 |
| 2026-05-16 00:00 |
21:18:32.05 |
+22:01:09.8 |
HIP 105161 |
7.55 |
| 2026-05-16 12:00 |
21:18:31.59 |
+22:01:34.4 |
HIP 105161 |
7.17 |
| 2026-05-17 00:00 |
21:18:31.11 |
+22:01:58.9 |
HIP 105161 |
6.80 |
| 2026-05-17 12:00 |
21:18:30.59 |
+22:02:23.2 |
HIP 105161 |
6.43 |
| 2026-05-18 00:00 |
21:18:30.04 |
+22:02:47.4 |
HIP 105161 |
6.06 |
| 2026-05-18 12:00 |
21:18:29.47 |
+22:03:11.5 |
HIP 105161 |
5.70 |
| 2026-05-19 00:00 |
21:18:28.87 |
+22:03:35.5 |
HIP 105161 |
5.34 |
| 2026-05-19 12:00 |
21:18:28.24 |
+22:03:59.3 |
HIP 105161 |
4.98 |
| 2026-05-20 00:00 |
21:18:27.58 |
+22:04:22.9 |
HIP 105161 |
4.64 |
| 2026-05-20 12:00 |
21:18:26.89 |
+22:04:46.4 |
HIP 105161 |
4.30 |
| 2026-05-21 00:00 |
21:18:26.18 |
+22:05:09.8 |
HIP 105161 |
3.98 |
| 2026-05-21 12:00 |
21:18:25.43 |
+22:05:33.0 |
HIP 105161 |
3.67 |
| 2026-05-22 00:00 |
21:18:24.66 |
+22:05:56.1 |
HIP 105161 |
3.38 |
| 2026-05-22 12:00 |
21:18:23.86 |
+22:06:19.0 |
HIP 105161 |
3.11 |
| 2026-05-23 00:00 |
21:18:23.04 |
+22:06:41.8 |
HIP 105161 |
2.87 |
| 2026-05-23 12:00 |
21:18:22.18 |
+22:07:04.4 |
HIP 105161 |
2.68 |
| 2026-05-24 00:00 |
21:18:21.30 |
+22:07:26.8 |
HIP 105161 |
2.54 |
| 2026-05-24 12:00 |
21:18:20.38 |
+22:07:49.1 |
HIP 105161 |
2.45 |
| 2026-05-25 00:00 |
21:18:19.45 |
+22:08:11.3 |
HIP 105161 |
2.44 |
| 2026-05-25 12:00 |
21:18:18.48 |
+22:08:33.2 |
HIP 105161 |
2.49 |
| 2026-05-26 00:00 |
21:18:17.48 |
+22:08:55.0 |
HIP 105161 |
2.60 |
| 2026-05-26 12:00 |
21:18:16.46 |
+22:09:16.7 |
HIP 105161 |
2.77 |
| 2026-05-27 00:00 |
21:18:15.41 |
+22:09:38.2 |
HIP 105161 |
2.99 |
| 2026-05-27 12:00 |
21:18:14.34 |
+22:09:59.5 |
HIP 105161 |
3.25 |
| 2026-05-28 00:00 |
21:18:13.23 |
+22:10:20.6 |
HIP 105161 |
3.54 |
| 2026-05-28 12:00 |
21:18:12.10 |
+22:10:41.6 |
HIP 105161 |
3.85 |
| 2026-05-29 00:00 |
21:18:10.94 |
+22:11:02.3 |
HIP 105161 |
4.18 |
| 2026-05-29 12:00 |
21:18:09.76 |
+22:11:23.0 |
HIP 105161 |
4.53 |
| 2026-05-30 00:00 |
21:18:08.55 |
+22:11:43.4 |
HIP 105161 |
4.89 |
| 2026-05-30 12:00 |
21:18:07.31 |
+22:12:03.6 |
HIP 105161 |
5.26 |
| 2026-05-31 00:00 |
21:18:06.04 |
+22:12:23.7 |
HIP 105161 |
5.64 |
| 2026-05-31 12:00 |
21:18:04.75 |
+22:12:43.6 |
HIP 105161 |
6.03 |
| 2026-06-01 00:00 |
21:18:03.43 |
+22:13:03.3 |
HIP 105161 |
6.42 |
| 2026-06-01 12:00 |
21:18:02.08 |
+22:13:22.8 |
HIP 105161 |
6.82 |
| 2026-06-02 00:00 |
21:18:00.71 |
+22:13:42.2 |
HIP 105161 |
7.22 |