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) |
| 2026-03-26 00:00 |
19:35:06.18 |
+15:23:19.1 |
HIP 96278 |
8.56 |
| 2026-03-26 12:00 |
19:35:07.11 |
+15:23:54.2 |
HIP 96278 |
8.44 |
| 2026-03-27 00:00 |
19:35:08.01 |
+15:24:29.4 |
HIP 96278 |
8.37 |
| 2026-03-27 12:00 |
19:35:08.88 |
+15:25:04.6 |
HIP 96278 |
8.33 |
| 2026-03-28 00:00 |
19:35:09.72 |
+15:25:39.8 |
HIP 96278 |
8.34 |
| 2026-03-28 12:00 |
19:35:10.54 |
+15:26:15.1 |
HIP 96278 |
8.38 |
| 2026-03-29 00:00 |
19:35:11.32 |
+15:26:50.3 |
HIP 96278 |
8.47 |
| 2026-03-29 12:00 |
19:35:12.08 |
+15:27:25.6 |
HIP 96278 |
8.59 |
| 2026-03-30 00:00 |
19:35:12.81 |
+15:28:00.9 |
HIP 96278 |
8.74 |
| 2026-03-30 12:00 |
19:35:13.51 |
+15:28:36.2 |
HIP 96353 |
8.68 |
| 2026-03-31 00:00 |
19:35:14.18 |
+15:29:11.5 |
HIP 96353 |
8.08 |
| 2026-03-31 12:00 |
19:35:14.82 |
+15:29:46.8 |
HIP 96353 |
7.48 |
| 2026-04-01 00:00 |
19:35:15.43 |
+15:30:22.2 |
HIP 96353 |
6.88 |
| 2026-04-01 12:00 |
19:35:16.01 |
+15:30:57.5 |
HIP 96353 |
6.28 |
| 2026-04-02 00:00 |
19:35:16.57 |
+15:31:32.9 |
HIP 96353 |
5.70 |
| 2026-04-02 12:00 |
19:35:17.09 |
+15:32:08.2 |
HIP 96353 |
5.12 |
| 2026-04-03 00:00 |
19:35:17.59 |
+15:32:43.6 |
HIP 96353 |
4.54 |
| 2026-04-03 12:00 |
19:35:18.06 |
+15:33:18.9 |
HIP 96353 |
3.99 |
| 2026-04-04 00:00 |
19:35:18.49 |
+15:33:54.2 |
HIP 96353 |
3.45 |
| 2026-04-04 12:00 |
19:35:18.90 |
+15:34:29.6 |
HIP 96353 |
2.93 |
| 2026-04-05 00:00 |
19:35:19.28 |
+15:35:04.9 |
HIP 96353 |
2.46 |
| 2026-04-05 12:00 |
19:35:19.63 |
+15:35:40.2 |
HIP 96353 |
2.07 |
| 2026-04-06 00:00 |
19:35:19.95 |
+15:36:15.5 |
HIP 96353 |
1.79 |
| 2026-04-06 12:00 |
19:35:20.24 |
+15:36:50.8 |
HIP 96353 |
1.69 |
| 2026-04-07 00:00 |
19:35:20.51 |
+15:37:26.0 |
HIP 96353 |
1.80 |
| 2026-04-07 12:00 |
19:35:20.74 |
+15:38:01.2 |
HIP 96353 |
2.09 |
| 2026-04-08 00:00 |
19:35:20.94 |
+15:38:36.5 |
HIP 96353 |
2.49 |
| 2026-04-08 12:00 |
19:35:21.11 |
+15:39:11.7 |
HIP 96353 |
2.95 |
| 2026-04-09 00:00 |
19:35:21.26 |
+15:39:46.8 |
HIP 96353 |
3.46 |
| 2026-04-09 12:00 |
19:35:21.37 |
+15:40:21.9 |
HIP 96353 |
3.99 |
| 2026-04-10 00:00 |
19:35:21.45 |
+15:40:57.1 |
HIP 96353 |
4.53 |
| 2026-04-10 12:00 |
19:35:21.51 |
+15:41:32.1 |
HIP 96353 |
5.09 |
| 2026-04-11 00:00 |
19:35:21.53 |
+15:42:07.2 |
HIP 96353 |
5.65 |
| 2026-04-11 12:00 |
19:35:21.52 |
+15:42:42.1 |
HIP 96353 |
6.22 |
| 2026-04-12 00:00 |
19:35:21.49 |
+15:43:17.1 |
HIP 96353 |
6.79 |
| 2026-04-12 12:00 |
19:35:21.42 |
+15:43:52.0 |
HIP 96353 |
7.37 |
| 2026-04-13 00:00 |
19:35:21.33 |
+15:44:26.9 |
HIP 96353 |
7.94 |
| 2026-04-13 12:00 |
19:35:21.20 |
+15:45:01.7 |
HIP 96353 |
8.52 |
| 2026-04-14 00:00 |
19:35:21.05 |
+15:45:36.5 |
HIP 96353 |
9.10 |
| 2026-04-14 12:00 |
19:35:20.86 |
+15:46:11.2 |
HIP 96353 |
9.67 |
| 2026-04-15 00:00 |
19:35:20.64 |
+15:46:45.8 |
HIP 96353 |
10.25 |
| 2026-04-15 12:00 |
19:35:20.40 |
+15:47:20.4 |
HIP 96353 |
10.83 |
| 2026-04-16 00:00 |
19:35:20.12 |
+15:47:55.0 |
HIP 96353 |
11.41 |