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 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
21:13:05.46 |
+22:24:16.9 |
HIP 104782 |
15.18 |
| 2026-07-29 12:00 |
21:13:02.07 |
+22:24:07.0 |
HIP 104782 |
15.72 |
| 2026-07-30 00:00 |
21:12:58.69 |
+22:23:56.7 |
HIP 104782 |
16.28 |
| 2026-07-30 12:00 |
21:12:55.30 |
+22:23:46.2 |
HIP 104782 |
16.86 |
| 2026-07-31 00:00 |
21:12:51.90 |
+22:23:35.4 |
HIP 104782 |
17.47 |
| 2026-07-31 12:00 |
21:12:48.50 |
+22:23:24.3 |
HIP 104782 |
18.10 |
| 2026-08-01 00:00 |
21:12:45.10 |
+22:23:12.9 |
HIP 104782 |
18.74 |
| 2026-08-01 12:00 |
21:12:41.69 |
+22:23:01.3 |
HIP 104782 |
19.40 |
| 2026-08-02 00:00 |
21:12:38.28 |
+22:22:49.4 |
HIP 104782 |
20.08 |
| 2026-08-02 12:00 |
21:12:34.87 |
+22:22:37.2 |
HIP 104782 |
20.77 |
| 2026-08-03 00:00 |
21:12:31.45 |
+22:22:24.8 |
HIP 104782 |
21.47 |
| 2026-08-03 12:00 |
21:12:28.03 |
+22:22:12.0 |
HIP 104782 |
22.18 |
| 2026-08-04 00:00 |
21:12:24.61 |
+22:21:59.0 |
HIP 104782 |
22.90 |
| 2026-08-04 12:00 |
21:12:21.18 |
+22:21:45.7 |
HIP 104782 |
23.64 |
| 2026-08-05 00:00 |
21:12:17.76 |
+22:21:32.2 |
HIP 104782 |
24.38 |
| 2026-08-05 12:00 |
21:12:14.33 |
+22:21:18.4 |
HIP 104539 |
24.38 |
| 2026-08-06 00:00 |
21:12:10.90 |
+22:21:04.3 |
HIP 104539 |
23.67 |
| 2026-08-06 12:00 |
21:12:07.47 |
+22:20:49.9 |
HIP 104539 |
22.98 |
| 2026-08-07 00:00 |
21:12:04.04 |
+22:20:35.3 |
HIP 104539 |
22.29 |
| 2026-08-07 12:00 |
21:12:00.61 |
+22:20:20.4 |
HIP 104539 |
21.61 |
| 2026-08-08 00:00 |
21:11:57.17 |
+22:20:05.2 |
HIP 104539 |
20.95 |
| 2026-08-08 12:00 |
21:11:53.74 |
+22:19:49.8 |
HIP 104539 |
20.30 |
| 2026-08-09 00:00 |
21:11:50.31 |
+22:19:34.1 |
HIP 104539 |
19.66 |
| 2026-08-09 12:00 |
21:11:46.88 |
+22:19:18.1 |
HIP 104539 |
19.05 |
| 2026-08-10 00:00 |
21:11:43.45 |
+22:19:01.9 |
HIP 104539 |
18.45 |
| 2026-08-10 12:00 |
21:11:40.02 |
+22:18:45.4 |
HIP 104539 |
17.87 |
| 2026-08-11 00:00 |
21:11:36.59 |
+22:18:28.6 |
HIP 104539 |
17.32 |
| 2026-08-11 12:00 |
21:11:33.16 |
+22:18:11.6 |
HIP 104539 |
16.80 |
| 2026-08-12 00:00 |
21:11:29.74 |
+22:17:54.3 |
HIP 104539 |
16.30 |
| 2026-08-12 12:00 |
21:11:26.32 |
+22:17:36.8 |
HIP 104539 |
15.84 |
| 2026-08-13 00:00 |
21:11:22.89 |
+22:17:18.9 |
HIP 104539 |
15.41 |
| 2026-08-13 12:00 |
21:11:19.48 |
+22:17:00.9 |
HIP 104539 |
15.02 |
| 2026-08-14 00:00 |
21:11:16.06 |
+22:16:42.5 |
HIP 104539 |
14.67 |
| 2026-08-14 12:00 |
21:11:12.65 |
+22:16:24.0 |
HIP 104539 |
14.37 |
| 2026-08-15 00:00 |
21:11:09.24 |
+22:16:05.1 |
HIP 104539 |
14.11 |
| 2026-08-15 12:00 |
21:11:05.84 |
+22:15:46.0 |
HIP 104539 |
13.91 |
| 2026-08-16 00:00 |
21:11:02.44 |
+22:15:26.7 |
HIP 104539 |
13.76 |
| 2026-08-16 12:00 |
21:10:59.05 |
+22:15:07.1 |
HIP 104539 |
13.67 |
| 2026-08-17 00:00 |
21:10:55.65 |
+22:14:47.3 |
HIP 104539 |
13.63 |
| 2026-08-17 12:00 |
21:10:52.27 |
+22:14:27.2 |
HIP 104539 |
13.65 |
| 2026-08-18 00:00 |
21:10:48.89 |
+22:14:06.8 |
HIP 104539 |
13.73 |
| 2026-08-18 12:00 |
21:10:45.51 |
+22:13:46.2 |
HIP 104539 |
13.86 |
| 2026-08-19 00:00 |
21:10:42.15 |
+22:13:25.4 |
HIP 104539 |
14.05 |