メタデータ
| 項目 |
値 |
| Designation |
260P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-09-12T12:08:17.128320Z |
| Orbit solution date (soln_date, UTC) |
2022-08-01T05:07:28Z |
| Obs used |
6700 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-13.0000000 |
| e |
0.59426383 |
| q (au) |
1.491464 |
| a (au) |
3.675946 |
| i (deg) |
15.768614 |
| Ω (om, deg) |
351.863193 |
| ω (w, deg) |
15.578162 |
| M (ma, deg) |
106.352166 |
等級
散乱 + 全体線形
$$
M_a = (12.521 + 5.334\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.521 |
| n |
5.334 |
| gf |
1.000 |
| gb |
-0.692 |
| k |
0.957 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
21:24:36.49 |
-25:55:53.3 |
HIP 105757 |
13.01 |
| 2026-03-26 12:00 |
21:25:50.92 |
-25:49:42.9 |
HIP 105757 |
18.80 |
| 2026-03-27 00:00 |
21:27:05.36 |
-25:43:30.0 |
HIP 106034 |
22.13 |
| 2026-03-27 12:00 |
21:28:19.82 |
-25:37:14.5 |
HIP 106034 |
5.01 |
| 2026-03-28 00:00 |
21:29:34.29 |
-25:30:56.4 |
HIP 106034 |
14.24 |
| 2026-03-28 12:00 |
21:30:48.77 |
-25:24:35.7 |
HIP 106289 |
13.26 |
| 2026-03-29 00:00 |
21:32:03.26 |
-25:18:12.4 |
HIP 106289 |
5.29 |
| 2026-03-29 12:00 |
21:33:17.77 |
-25:11:46.6 |
HIP 106520 |
22.01 |
| 2026-03-30 00:00 |
21:34:32.29 |
-25:05:18.1 |
HIP 106520 |
8.31 |
| 2026-03-30 12:00 |
21:35:46.83 |
-24:58:47.0 |
HIP 106520 |
17.54 |
| 2026-03-31 00:00 |
21:37:01.38 |
-24:52:13.3 |
HIP 106792 |
22.55 |
| 2026-03-31 12:00 |
21:38:15.94 |
-24:45:37.0 |
HIP 106759 |
20.77 |
| 2026-04-01 00:00 |
21:39:30.51 |
-24:38:58.0 |
HIP 106997 |
9.49 |
| 2026-04-01 12:00 |
21:40:45.10 |
-24:32:16.4 |
HIP 106997 |
12.15 |
| 2026-04-02 00:00 |
21:41:59.71 |
-24:25:32.2 |
HIP 107124 |
13.66 |
| 2026-04-02 12:00 |
21:43:14.33 |
-24:18:45.3 |
HIP 107248 |
10.38 |
| 2026-04-03 00:00 |
21:44:28.96 |
-24:11:55.8 |
HIP 107248 |
15.94 |
| 2026-04-03 12:00 |
21:45:43.60 |
-24:05:03.7 |
HIP 107248 |
32.78 |
| 2026-04-04 00:00 |
21:46:58.27 |
-23:58:08.9 |
HIP 107641 |
17.37 |
| 2026-04-04 12:00 |
21:48:12.94 |
-23:51:11.4 |
HIP 107641 |
12.14 |
| 2026-04-05 00:00 |
21:49:27.63 |
-23:44:11.2 |
HIP 107691 |
9.57 |
| 2026-04-05 12:00 |
21:50:42.34 |
-23:37:08.4 |
HIP 107877 |
23.03 |
| 2026-04-06 00:00 |
21:51:57.06 |
-23:30:03.0 |
HIP 107877 |
15.73 |
| 2026-04-06 12:00 |
21:53:11.79 |
-23:22:54.8 |
HIP 107877 |
25.55 |
| 2026-04-07 00:00 |
21:54:26.54 |
-23:15:44.0 |
HIP 108219 |
14.04 |
| 2026-04-07 12:00 |
21:55:41.30 |
-23:08:30.5 |
HIP 108243 |
5.34 |
| 2026-04-08 00:00 |
21:56:56.08 |
-23:01:14.3 |
HIP 108243 |
16.96 |
| 2026-04-08 12:00 |
21:58:10.87 |
-22:53:55.4 |
HIP 108540 |
15.44 |
| 2026-04-09 00:00 |
21:59:25.68 |
-22:46:33.8 |
HIP 108540 |
6.05 |
| 2026-04-09 12:00 |
22:00:40.50 |
-22:39:09.6 |
HIP 108540 |
23.21 |
| 2026-04-10 00:00 |
22:01:55.33 |
-22:31:42.6 |
HIP 108540 |
41.82 |
| 2026-04-10 12:00 |
22:03:10.19 |
-22:24:13.0 |
HIP 109000 |
25.84 |
| 2026-04-11 00:00 |
22:04:25.05 |
-22:16:40.6 |
HIP 109000 |
7.00 |
| 2026-04-11 12:00 |
22:05:39.93 |
-22:09:05.6 |
HIP 109000 |
12.00 |
| 2026-04-12 00:00 |
22:06:54.82 |
-22:01:27.8 |
HIP 109199 |
13.80 |
| 2026-04-12 12:00 |
22:08:09.73 |
-21:53:47.3 |
HIP 109241 |
18.72 |
| 2026-04-13 00:00 |
22:09:24.65 |
-21:46:04.1 |
HIP 109241 |
24.14 |
| 2026-04-13 12:00 |
22:10:39.58 |
-21:38:18.3 |
HIP 109509 |
24.91 |
| 2026-04-14 00:00 |
22:11:54.53 |
-21:30:29.7 |
HIP 109689 |
18.47 |
| 2026-04-14 12:00 |
22:13:09.50 |
-21:22:38.3 |
HIP 109689 |
1.72 |
| 2026-04-15 00:00 |
22:14:24.47 |
-21:14:44.3 |
HIP 109786 |
10.37 |
| 2026-04-15 12:00 |
22:15:39.46 |
-21:06:47.6 |
HIP 109915 |
9.80 |
| 2026-04-16 00:00 |
22:16:54.46 |
-20:58:48.1 |
HIP 109915 |
24.76 |