P/2008 Y3 (McNaught)
メタデータ
| 項目 |
値 |
| Designation |
P/2008 Y3 (McNaught) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-01-11T23:10:23.174400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:26Z |
| Obs used |
164 |
| NEO |
- |
| M1 |
4.500 |
| K1 |
16.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-02-17.0000000 |
| e |
0.44766720 |
| q (au) |
4.434244 |
| a (au) |
8.028211 |
| i (deg) |
38.813188 |
| Ω (om, deg) |
262.934144 |
| ω (w, deg) |
238.279400 |
| M (ma, deg) |
1.561327 |
等級
散乱 + 全体線形
$$
M_a = (4.713 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.713 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.998 |
| 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 |
23:06:17.92 |
+33:22:35.6 |
HIP 113985 |
16.05 |
| 2026-02-03 12:00 |
23:06:32.67 |
+33:22:37.7 |
HIP 113985 |
19.13 |
| 2026-02-04 00:00 |
23:06:47.46 |
+33:22:40.7 |
HIP 114116 |
20.57 |
| 2026-02-04 12:00 |
23:07:02.30 |
+33:22:44.6 |
HIP 114116 |
21.09 |
| 2026-02-05 00:00 |
23:07:17.19 |
+33:22:49.6 |
HIP 114116 |
22.06 |
| 2026-02-05 12:00 |
23:07:32.12 |
+33:22:55.5 |
HIP 114116 |
23.42 |
| 2026-02-06 00:00 |
23:07:47.10 |
+33:23:02.4 |
HIP 114116 |
25.12 |
| 2026-02-06 12:00 |
23:08:02.12 |
+33:23:10.3 |
HIP 114116 |
27.10 |
| 2026-02-07 00:00 |
23:08:17.19 |
+33:23:19.1 |
HIP 114121 |
29.28 |
| 2026-02-07 12:00 |
23:08:32.30 |
+33:23:28.9 |
HIP 114404 |
30.25 |
| 2026-02-08 00:00 |
23:08:47.46 |
+33:23:39.7 |
HIP 114404 |
28.10 |
| 2026-02-08 12:00 |
23:09:02.66 |
+33:23:51.4 |
HIP 114404 |
26.15 |
| 2026-02-09 00:00 |
23:09:17.90 |
+33:24:04.1 |
HIP 114404 |
24.43 |
| 2026-02-09 12:00 |
23:09:33.18 |
+33:24:17.8 |
HIP 114404 |
23.01 |
| 2026-02-10 00:00 |
23:09:48.50 |
+33:24:32.4 |
HIP 114404 |
21.95 |
| 2026-02-10 12:00 |
23:10:03.86 |
+33:24:48.0 |
HIP 114404 |
21.30 |
| 2026-02-11 00:00 |
23:10:19.27 |
+33:25:04.6 |
HIP 114404 |
21.11 |
| 2026-02-11 12:00 |
23:10:34.71 |
+33:25:22.1 |
HIP 114404 |
21.39 |
| 2026-02-12 00:00 |
23:10:50.19 |
+33:25:40.6 |
HIP 114404 |
22.14 |
| 2026-02-12 12:00 |
23:11:05.71 |
+33:26:00.0 |
HIP 114404 |
23.30 |
| 2026-02-13 00:00 |
23:11:21.26 |
+33:26:20.4 |
HIP 114404 |
24.83 |
| 2026-02-13 12:00 |
23:11:36.85 |
+33:26:41.7 |
HIP 114498 |
24.85 |
| 2026-02-14 00:00 |
23:11:52.48 |
+33:27:04.0 |
HIP 114498 |
25.09 |
| 2026-02-14 12:00 |
23:12:08.14 |
+33:27:27.2 |
HIP 114498 |
25.73 |
| 2026-02-15 00:00 |
23:12:23.84 |
+33:27:51.3 |
HIP 114498 |
26.75 |
| 2026-02-15 12:00 |
23:12:39.57 |
+33:28:16.5 |
HIP 114498 |
28.11 |
| 2026-02-16 00:00 |
23:12:55.33 |
+33:28:42.5 |
HIP 114498 |
29.77 |
| 2026-02-16 12:00 |
23:13:11.13 |
+33:29:09.5 |
HIP 114717 |
30.52 |
| 2026-02-17 00:00 |
23:13:26.96 |
+33:29:37.4 |
HIP 114717 |
29.64 |
| 2026-02-17 12:00 |
23:13:42.82 |
+33:30:06.2 |
HIP 114717 |
29.13 |
| 2026-02-18 00:00 |
23:13:58.71 |
+33:30:36.0 |
HIP 114717 |
29.02 |
| 2026-02-18 12:00 |
23:14:14.63 |
+33:31:06.7 |
HIP 114717 |
29.31 |
| 2026-02-19 00:00 |
23:14:30.58 |
+33:31:38.3 |
HIP 114717 |
29.99 |
| 2026-02-19 12:00 |
23:14:46.56 |
+33:32:10.9 |
HIP 114915 |
30.99 |
| 2026-02-20 00:00 |
23:15:02.57 |
+33:32:44.3 |
HIP 114915 |
28.23 |
| 2026-02-20 12:00 |
23:15:18.60 |
+33:33:18.7 |
HIP 114915 |
25.60 |
| 2026-02-21 00:00 |
23:15:34.66 |
+33:33:54.0 |
HIP 114915 |
23.15 |
| 2026-02-21 12:00 |
23:15:50.74 |
+33:34:30.2 |
HIP 114915 |
20.96 |
| 2026-02-22 00:00 |
23:16:06.86 |
+33:35:07.3 |
HIP 114915 |
19.10 |
| 2026-02-22 12:00 |
23:16:22.99 |
+33:35:45.3 |
HIP 114915 |
17.69 |
| 2026-02-23 00:00 |
23:16:39.15 |
+33:36:24.2 |
HIP 114915 |
16.86 |
| 2026-02-23 12:00 |
23:16:55.33 |
+33:37:04.0 |
HIP 114915 |
16.68 |
| 2026-02-24 00:00 |
23:17:11.54 |
+33:37:44.6 |
HIP 114915 |
17.19 |