C/2007 Y2 (McNaught)
メタデータ
| 項目 |
値 |
| Designation |
C/2007 Y2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-08T09:35:06.708480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:15Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-03-10.0000000 |
| e |
0.99652600 |
| q (au) |
4.208958 |
| a (au) |
1211.561103 |
| i (deg) |
98.503197 |
| Ω (om, deg) |
303.462012 |
| ω (w, deg) |
257.686731 |
| M (ma, deg) |
359.999313 |
等級
散乱 + 全体線形
$$
M_a = (9.769 + 3.626\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.769 |
| n |
3.626 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
0.998 |
| 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) |
| 2026-02-03 00:00 |
19:31:25.00 |
+14:32:30.7 |
HIP 96060 |
15.43 |
| 2026-02-03 12:00 |
19:31:28.10 |
+14:32:52.2 |
HIP 96060 |
15.40 |
| 2026-02-04 00:00 |
19:31:31.19 |
+14:33:14.0 |
HIP 96060 |
15.43 |
| 2026-02-04 12:00 |
19:31:34.26 |
+14:33:35.9 |
HIP 96060 |
15.51 |
| 2026-02-05 00:00 |
19:31:37.32 |
+14:33:58.1 |
HIP 96060 |
15.63 |
| 2026-02-05 12:00 |
19:31:40.37 |
+14:34:20.5 |
HIP 96060 |
15.80 |
| 2026-02-06 00:00 |
19:31:43.41 |
+14:34:43.1 |
HIP 96060 |
16.01 |
| 2026-02-06 12:00 |
19:31:46.43 |
+14:35:05.9 |
HIP 96060 |
16.27 |
| 2026-02-07 00:00 |
19:31:49.45 |
+14:35:28.9 |
HIP 96060 |
16.57 |
| 2026-02-07 12:00 |
19:31:52.44 |
+14:35:52.1 |
HIP 96060 |
16.91 |
| 2026-02-08 00:00 |
19:31:55.43 |
+14:36:15.6 |
HIP 96060 |
17.28 |
| 2026-02-08 12:00 |
19:31:58.40 |
+14:36:39.2 |
HIP 96060 |
17.69 |
| 2026-02-09 00:00 |
19:32:01.36 |
+14:37:03.1 |
HIP 96060 |
18.13 |
| 2026-02-09 12:00 |
19:32:04.30 |
+14:37:27.1 |
HIP 96060 |
18.59 |
| 2026-02-10 00:00 |
19:32:07.23 |
+14:37:51.4 |
HIP 96060 |
19.09 |
| 2026-02-10 12:00 |
19:32:10.15 |
+14:38:15.8 |
HIP 96060 |
19.60 |
| 2026-02-11 00:00 |
19:32:13.05 |
+14:38:40.5 |
HIP 96057 |
20.02 |
| 2026-02-11 12:00 |
19:32:15.93 |
+14:39:05.4 |
HIP 96057 |
19.80 |
| 2026-02-12 00:00 |
19:32:18.80 |
+14:39:30.4 |
HIP 96057 |
19.60 |
| 2026-02-12 12:00 |
19:32:21.66 |
+14:39:55.7 |
HIP 96057 |
19.43 |
| 2026-02-13 00:00 |
19:32:24.49 |
+14:40:21.1 |
HIP 96057 |
19.29 |
| 2026-02-13 12:00 |
19:32:27.32 |
+14:40:46.8 |
HIP 96057 |
19.17 |
| 2026-02-14 00:00 |
19:32:30.12 |
+14:41:12.6 |
HIP 96057 |
19.09 |
| 2026-02-14 12:00 |
19:32:32.91 |
+14:41:38.6 |
HIP 96057 |
19.03 |
| 2026-02-15 00:00 |
19:32:35.69 |
+14:42:04.8 |
HIP 96057 |
19.00 |
| 2026-02-15 12:00 |
19:32:38.44 |
+14:42:31.2 |
HIP 96057 |
19.00 |
| 2026-02-16 00:00 |
19:32:41.18 |
+14:42:57.8 |
HIP 96057 |
19.03 |
| 2026-02-16 12:00 |
19:32:43.91 |
+14:43:24.6 |
HIP 96057 |
19.09 |
| 2026-02-17 00:00 |
19:32:46.61 |
+14:43:51.5 |
HIP 96057 |
19.18 |
| 2026-02-17 12:00 |
19:32:49.30 |
+14:44:18.7 |
HIP 96057 |
19.29 |
| 2026-02-18 00:00 |
19:32:51.97 |
+14:44:46.0 |
HIP 96057 |
19.43 |
| 2026-02-18 12:00 |
19:32:54.62 |
+14:45:13.5 |
HIP 96057 |
19.59 |
| 2026-02-19 00:00 |
19:32:57.26 |
+14:45:41.1 |
HIP 96057 |
19.78 |
| 2026-02-19 12:00 |
19:32:59.87 |
+14:46:09.0 |
HIP 96057 |
20.00 |
| 2026-02-20 00:00 |
19:33:02.47 |
+14:46:37.0 |
HIP 96057 |
20.23 |
| 2026-02-20 12:00 |
19:33:05.05 |
+14:47:05.1 |
HIP 96057 |
20.49 |
| 2026-02-21 00:00 |
19:33:07.60 |
+14:47:33.5 |
HIP 96057 |
20.77 |
| 2026-02-21 12:00 |
19:33:10.14 |
+14:48:02.0 |
HIP 96057 |
21.07 |
| 2026-02-22 00:00 |
19:33:12.66 |
+14:48:30.7 |
HIP 96057 |
21.38 |
| 2026-02-22 12:00 |
19:33:15.16 |
+14:48:59.5 |
HIP 96057 |
21.72 |
| 2026-02-23 00:00 |
19:33:17.64 |
+14:49:28.5 |
HIP 96057 |
22.07 |
| 2026-02-23 12:00 |
19:33:20.10 |
+14:49:57.6 |
HIP 96057 |
22.43 |
| 2026-02-24 00:00 |
19:33:22.54 |
+14:50:27.0 |
HIP 96057 |
22.81 |