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) |
| 2026-07-29 00:00 |
00:11:19.66 |
+43:09:32.8 |
HIP 808 |
22.45 |
| 2026-07-29 12:00 |
00:11:15.81 |
+43:11:04.9 |
HIP 808 |
20.84 |
| 2026-07-30 00:00 |
00:11:11.84 |
+43:12:36.1 |
HIP 808 |
19.24 |
| 2026-07-30 12:00 |
00:11:07.74 |
+43:14:06.4 |
HIP 808 |
17.65 |
| 2026-07-31 00:00 |
00:11:03.51 |
+43:15:35.8 |
HIP 808 |
16.07 |
| 2026-07-31 12:00 |
00:10:59.16 |
+43:17:04.4 |
HIP 808 |
14.51 |
| 2026-08-01 00:00 |
00:10:54.68 |
+43:18:32.0 |
HIP 808 |
12.96 |
| 2026-08-01 12:00 |
00:10:50.07 |
+43:19:58.7 |
HIP 808 |
11.44 |
| 2026-08-02 00:00 |
00:10:45.34 |
+43:21:24.5 |
HIP 808 |
9.96 |
| 2026-08-02 12:00 |
00:10:40.48 |
+43:22:49.3 |
HIP 808 |
8.53 |
| 2026-08-03 00:00 |
00:10:35.50 |
+43:24:13.2 |
HIP 808 |
7.19 |
| 2026-08-03 12:00 |
00:10:30.39 |
+43:25:36.2 |
HIP 808 |
6.00 |
| 2026-08-04 00:00 |
00:10:25.15 |
+43:26:58.2 |
HIP 808 |
5.05 |
| 2026-08-04 12:00 |
00:10:19.80 |
+43:28:19.2 |
HIP 808 |
4.51 |
| 2026-08-05 00:00 |
00:10:14.31 |
+43:29:39.2 |
HIP 808 |
4.52 |
| 2026-08-05 12:00 |
00:10:08.71 |
+43:30:58.2 |
HIP 808 |
5.08 |
| 2026-08-06 00:00 |
00:10:02.98 |
+43:32:16.3 |
HIP 808 |
6.05 |
| 2026-08-06 12:00 |
00:09:57.12 |
+43:33:33.3 |
HIP 808 |
7.25 |
| 2026-08-07 00:00 |
00:09:51.15 |
+43:34:49.3 |
HIP 808 |
8.60 |
| 2026-08-07 12:00 |
00:09:45.05 |
+43:36:04.3 |
HIP 808 |
10.03 |
| 2026-08-08 00:00 |
00:09:38.83 |
+43:37:18.2 |
HIP 808 |
11.51 |
| 2026-08-08 12:00 |
00:09:32.49 |
+43:38:31.1 |
HIP 808 |
13.03 |
| 2026-08-09 00:00 |
00:09:26.02 |
+43:39:42.9 |
HIP 808 |
14.58 |
| 2026-08-09 12:00 |
00:09:19.44 |
+43:40:53.6 |
HIP 808 |
16.14 |
| 2026-08-10 00:00 |
00:09:12.74 |
+43:42:03.3 |
HIP 808 |
17.72 |
| 2026-08-10 12:00 |
00:09:05.91 |
+43:43:11.9 |
HIP 808 |
19.31 |
| 2026-08-11 00:00 |
00:08:58.97 |
+43:44:19.3 |
HIP 808 |
20.91 |
| 2026-08-11 12:00 |
00:08:51.91 |
+43:45:25.7 |
HIP 808 |
22.52 |
| 2026-08-12 00:00 |
00:08:44.73 |
+43:46:31.0 |
HIP 539 |
23.61 |
| 2026-08-12 12:00 |
00:08:37.44 |
+43:47:35.1 |
HIP 539 |
22.29 |
| 2026-08-13 00:00 |
00:08:30.03 |
+43:48:38.1 |
HIP 539 |
21.01 |
| 2026-08-13 12:00 |
00:08:22.50 |
+43:49:39.9 |
HIP 539 |
19.77 |
| 2026-08-14 00:00 |
00:08:14.86 |
+43:50:40.6 |
HIP 539 |
18.58 |
| 2026-08-14 12:00 |
00:08:07.11 |
+43:51:40.2 |
HIP 539 |
17.46 |
| 2026-08-15 00:00 |
00:07:59.24 |
+43:52:38.5 |
HIP 539 |
16.41 |
| 2026-08-15 12:00 |
00:07:51.27 |
+43:53:35.7 |
HIP 539 |
15.45 |
| 2026-08-16 00:00 |
00:07:43.18 |
+43:54:31.7 |
HIP 539 |
14.61 |
| 2026-08-16 12:00 |
00:07:34.98 |
+43:55:26.6 |
HIP 539 |
13.91 |
| 2026-08-17 00:00 |
00:07:26.67 |
+43:56:20.2 |
HIP 539 |
13.37 |
| 2026-08-17 12:00 |
00:07:18.26 |
+43:57:12.6 |
HIP 539 |
13.01 |
| 2026-08-18 00:00 |
00:07:09.73 |
+43:58:03.8 |
HIP 539 |
12.86 |
| 2026-08-18 12:00 |
00:07:01.11 |
+43:58:53.8 |
HIP 539 |
12.92 |
| 2026-08-19 00:00 |
00:06:52.37 |
+43:59:42.6 |
HIP 539 |
13.20 |