メタデータ
| 項目 |
値 |
| Designation |
C/2012 Y3 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-08-25T20:18:44.000640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:30Z |
| Obs used |
150 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-02-01.0000000 |
| e |
0.93994217 |
| q (au) |
1.764843 |
| a (au) |
29.385733 |
| i (deg) |
73.231907 |
| Ω (om, deg) |
122.707962 |
| ω (w, deg) |
235.694296 |
| M (ma, deg) |
0.984727 |
等級
散乱 + 全体線形
$$
M_a = (11.507 + 5.732\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.507 |
| n |
5.732 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-05-12 00:00 |
09:44:17.41 |
+48:06:08.7 |
HIP 47633 |
25.20 |
| 2026-05-12 12:00 |
09:44:17.40 |
+48:05:35.9 |
HIP 47633 |
25.63 |
| 2026-05-13 00:00 |
09:44:17.44 |
+48:05:02.9 |
HIP 47633 |
26.07 |
| 2026-05-13 12:00 |
09:44:17.54 |
+48:04:29.8 |
HIP 47633 |
26.52 |
| 2026-05-14 00:00 |
09:44:17.68 |
+48:03:56.6 |
HIP 47633 |
26.99 |
| 2026-05-14 12:00 |
09:44:17.88 |
+48:03:23.3 |
HIP 47633 |
27.46 |
| 2026-05-15 00:00 |
09:44:18.13 |
+48:02:49.8 |
HIP 47633 |
27.94 |
| 2026-05-15 12:00 |
09:44:18.44 |
+48:02:16.1 |
HIP 47633 |
28.44 |
| 2026-05-16 00:00 |
09:44:18.79 |
+48:01:42.4 |
HIP 47633 |
28.94 |
| 2026-05-16 12:00 |
09:44:19.20 |
+48:01:08.5 |
HIP 47633 |
29.45 |
| 2026-05-17 00:00 |
09:44:19.67 |
+48:00:34.5 |
HIP 48013 |
29.56 |
| 2026-05-17 12:00 |
09:44:20.18 |
+48:00:00.3 |
HIP 48013 |
29.51 |
| 2026-05-18 00:00 |
09:44:20.74 |
+47:59:26.1 |
HIP 48013 |
29.46 |
| 2026-05-18 12:00 |
09:44:21.36 |
+47:58:51.7 |
HIP 48013 |
29.42 |
| 2026-05-19 00:00 |
09:44:22.03 |
+47:58:17.3 |
HIP 48013 |
29.38 |
| 2026-05-19 12:00 |
09:44:22.75 |
+47:57:42.7 |
HIP 48013 |
29.35 |
| 2026-05-20 00:00 |
09:44:23.53 |
+47:57:08.0 |
HIP 48013 |
29.31 |
| 2026-05-20 12:00 |
09:44:24.35 |
+47:56:33.2 |
HIP 48013 |
29.28 |
| 2026-05-21 00:00 |
09:44:25.22 |
+47:55:58.3 |
HIP 48013 |
29.26 |
| 2026-05-21 12:00 |
09:44:26.15 |
+47:55:23.4 |
HIP 48013 |
29.24 |
| 2026-05-22 00:00 |
09:44:27.13 |
+47:54:48.3 |
HIP 48013 |
29.22 |
| 2026-05-22 12:00 |
09:44:28.16 |
+47:54:13.1 |
HIP 48013 |
29.21 |
| 2026-05-23 00:00 |
09:44:29.23 |
+47:53:37.9 |
HIP 48013 |
29.20 |
| 2026-05-23 12:00 |
09:44:30.36 |
+47:53:02.6 |
HIP 48013 |
29.20 |
| 2026-05-24 00:00 |
09:44:31.54 |
+47:52:27.1 |
HIP 48013 |
29.21 |
| 2026-05-24 12:00 |
09:44:32.77 |
+47:51:51.6 |
HIP 48013 |
29.22 |
| 2026-05-25 00:00 |
09:44:34.05 |
+47:51:16.1 |
HIP 48013 |
29.23 |
| 2026-05-25 12:00 |
09:44:35.38 |
+47:50:40.4 |
HIP 48013 |
29.26 |
| 2026-05-26 00:00 |
09:44:36.75 |
+47:50:04.7 |
HIP 47618 |
29.09 |
| 2026-05-26 12:00 |
09:44:38.18 |
+47:49:28.9 |
HIP 47618 |
28.85 |
| 2026-05-27 00:00 |
09:44:39.66 |
+47:48:53.1 |
HIP 47618 |
28.62 |
| 2026-05-27 12:00 |
09:44:41.18 |
+47:48:17.2 |
HIP 47618 |
28.41 |
| 2026-05-28 00:00 |
09:44:42.76 |
+47:47:41.2 |
HIP 47618 |
28.22 |
| 2026-05-28 12:00 |
09:44:44.38 |
+47:47:05.2 |
HIP 47618 |
28.05 |
| 2026-05-29 00:00 |
09:44:46.05 |
+47:46:29.1 |
HIP 47618 |
27.90 |
| 2026-05-29 12:00 |
09:44:47.77 |
+47:45:52.9 |
HIP 47618 |
27.77 |
| 2026-05-30 00:00 |
09:44:49.53 |
+47:45:16.7 |
HIP 47618 |
27.66 |
| 2026-05-30 12:00 |
09:44:51.35 |
+47:44:40.5 |
HIP 47618 |
27.57 |
| 2026-05-31 00:00 |
09:44:53.21 |
+47:44:04.2 |
HIP 47618 |
27.51 |
| 2026-05-31 12:00 |
09:44:55.12 |
+47:43:27.9 |
HIP 47618 |
27.47 |
| 2026-06-01 00:00 |
09:44:57.08 |
+47:42:51.5 |
HIP 47618 |
27.46 |
| 2026-06-01 12:00 |
09:44:59.08 |
+47:42:15.1 |
HIP 47618 |
27.47 |
| 2026-06-02 00:00 |
09:45:01.13 |
+47:41:38.7 |
HIP 47618 |
27.50 |