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 |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
00:04:51.59 |
+39:10:32.1 |
HIP 325 |
8.64 |
| 2026-06-01 12:00 |
00:05:01.22 |
+39:12:49.3 |
HIP 325 |
11.33 |
| 2026-06-02 00:00 |
00:05:10.76 |
+39:15:06.5 |
HIP 325 |
14.10 |
| 2026-06-02 12:00 |
00:05:20.20 |
+39:17:23.8 |
HIP 325 |
16.92 |
| 2026-06-03 00:00 |
00:05:29.56 |
+39:19:41.0 |
HIP 325 |
19.76 |
| 2026-06-03 12:00 |
00:05:38.82 |
+39:21:58.3 |
HIP 325 |
22.60 |
| 2026-06-04 00:00 |
00:05:47.99 |
+39:24:15.6 |
HIP 325 |
25.44 |
| 2026-06-04 12:00 |
00:05:57.07 |
+39:26:32.9 |
HIP 325 |
28.28 |
| 2026-06-05 00:00 |
00:06:06.06 |
+39:28:50.1 |
HIP 325 |
31.11 |
| 2026-06-05 12:00 |
00:06:14.95 |
+39:31:07.4 |
HIP 630 |
33.42 |
| 2026-06-06 00:00 |
00:06:23.75 |
+39:33:24.6 |
HIP 625 |
34.37 |
| 2026-06-06 12:00 |
00:06:32.45 |
+39:35:41.8 |
HIP 625 |
31.60 |
| 2026-06-07 00:00 |
00:06:41.06 |
+39:37:59.0 |
HIP 625 |
28.85 |
| 2026-06-07 12:00 |
00:06:49.57 |
+39:40:16.1 |
HIP 625 |
26.13 |
| 2026-06-08 00:00 |
00:06:57.99 |
+39:42:33.2 |
HIP 625 |
23.43 |
| 2026-06-08 12:00 |
00:07:06.30 |
+39:44:50.3 |
HIP 625 |
20.76 |
| 2026-06-09 00:00 |
00:07:14.52 |
+39:47:07.3 |
HIP 625 |
18.14 |
| 2026-06-09 12:00 |
00:07:22.64 |
+39:49:24.2 |
HIP 625 |
15.58 |
| 2026-06-10 00:00 |
00:07:30.67 |
+39:51:41.0 |
HIP 625 |
13.10 |
| 2026-06-10 12:00 |
00:07:38.59 |
+39:53:57.8 |
HIP 625 |
10.75 |
| 2026-06-11 00:00 |
00:07:46.41 |
+39:56:14.5 |
HIP 625 |
8.63 |
| 2026-06-11 12:00 |
00:07:54.13 |
+39:58:31.1 |
HIP 625 |
6.95 |
| 2026-06-12 00:00 |
00:08:01.75 |
+40:00:47.6 |
HIP 625 |
6.05 |
| 2026-06-12 12:00 |
00:08:09.26 |
+40:03:04.0 |
HIP 625 |
6.26 |
| 2026-06-13 00:00 |
00:08:16.67 |
+40:05:20.3 |
HIP 625 |
7.49 |
| 2026-06-13 12:00 |
00:08:23.98 |
+40:07:36.5 |
HIP 626 |
8.89 |
| 2026-06-14 00:00 |
00:08:31.19 |
+40:09:52.6 |
HIP 626 |
10.22 |
| 2026-06-14 12:00 |
00:08:38.29 |
+40:12:08.5 |
HIP 626 |
11.98 |
| 2026-06-15 00:00 |
00:08:45.28 |
+40:14:24.2 |
HIP 626 |
14.00 |
| 2026-06-15 12:00 |
00:08:52.17 |
+40:16:39.9 |
HIP 714 |
13.02 |
| 2026-06-16 00:00 |
00:08:58.95 |
+40:18:55.3 |
HIP 714 |
10.89 |
| 2026-06-16 12:00 |
00:09:05.62 |
+40:21:10.6 |
HIP 714 |
9.00 |
| 2026-06-17 00:00 |
00:09:12.19 |
+40:23:25.7 |
HIP 714 |
7.54 |
| 2026-06-17 12:00 |
00:09:18.65 |
+40:25:40.7 |
HIP 714 |
6.76 |
| 2026-06-18 00:00 |
00:09:25.00 |
+40:27:55.4 |
HIP 714 |
6.88 |
| 2026-06-18 12:00 |
00:09:31.24 |
+40:30:10.0 |
HIP 714 |
7.86 |
| 2026-06-19 00:00 |
00:09:37.37 |
+40:32:24.4 |
HIP 714 |
9.41 |
| 2026-06-19 12:00 |
00:09:43.39 |
+40:34:38.5 |
HIP 714 |
11.30 |
| 2026-06-20 00:00 |
00:09:49.30 |
+40:36:52.4 |
HIP 714 |
13.37 |
| 2026-06-20 12:00 |
00:09:55.10 |
+40:39:06.2 |
HIP 737 |
15.08 |
| 2026-06-21 00:00 |
00:10:00.79 |
+40:41:19.6 |
HIP 737 |
14.26 |
| 2026-06-21 12:00 |
00:10:06.37 |
+40:43:32.9 |
HIP 737 |
13.82 |
| 2026-06-22 00:00 |
00:10:11.84 |
+40:45:45.9 |
HIP 737 |
13.79 |