278P/McNaught
メタデータ
| 項目 |
値 |
| Designation |
278P/McNaught |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-08-02T10:27:33.508800Z |
| Orbit solution date (soln_date, UTC) |
2021-09-20T00:13:08Z |
| Obs used |
519 |
| NEO |
- |
| M1 |
12.600 |
| K1 |
13.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-06-08.0000000 |
| e |
0.43343798 |
| q (au) |
2.096064 |
| a (au) |
3.699620 |
| i (deg) |
6.683671 |
| Ω (om, deg) |
15.492573 |
| ω (w, deg) |
237.922750 |
| M (ma, deg) |
93.431156 |
等級
散乱 + 全体線形
$$
M_a = (10.947 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.947 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.946 |
| 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) |
| 2026-02-03 00:00 |
08:04:34.42 |
+28:36:54.8 |
HIP 39729 |
35.28 |
| 2026-02-03 12:00 |
08:04:10.17 |
+28:37:36.4 |
HIP 39276 |
30.28 |
| 2026-02-04 00:00 |
08:03:46.02 |
+28:38:16.7 |
HIP 39276 |
24.98 |
| 2026-02-04 12:00 |
08:03:21.96 |
+28:38:55.8 |
HIP 39276 |
19.72 |
| 2026-02-05 00:00 |
08:02:58.02 |
+28:39:33.7 |
HIP 39276 |
14.52 |
| 2026-02-05 12:00 |
08:02:34.19 |
+28:40:10.3 |
HIP 39276 |
9.46 |
| 2026-02-06 00:00 |
08:02:10.47 |
+28:40:45.8 |
HIP 39276 |
4.86 |
| 2026-02-06 12:00 |
08:01:46.87 |
+28:41:20.0 |
HIP 39276 |
3.51 |
| 2026-02-07 00:00 |
08:01:23.40 |
+28:41:53.0 |
HIP 39276 |
7.40 |
| 2026-02-07 12:00 |
08:01:00.06 |
+28:42:24.8 |
HIP 39276 |
12.25 |
| 2026-02-08 00:00 |
08:00:36.85 |
+28:42:55.3 |
HIP 39276 |
17.24 |
| 2026-02-08 12:00 |
08:00:13.78 |
+28:43:24.6 |
HIP 39276 |
22.25 |
| 2026-02-09 00:00 |
07:59:50.86 |
+28:43:52.6 |
HIP 39276 |
27.25 |
| 2026-02-09 12:00 |
07:59:28.08 |
+28:44:19.4 |
HIP 39157 |
31.85 |
| 2026-02-10 00:00 |
07:59:05.45 |
+28:44:44.9 |
HIP 39157 |
33.96 |
| 2026-02-10 12:00 |
07:58:42.98 |
+28:45:09.2 |
HIP 38941 |
35.12 |
| 2026-02-11 00:00 |
07:58:20.68 |
+28:45:32.3 |
HIP 38941 |
34.65 |
| 2026-02-11 12:00 |
07:57:58.54 |
+28:45:54.1 |
HIP 38941 |
34.85 |
| 2026-02-12 00:00 |
07:57:36.57 |
+28:46:14.7 |
HIP 38941 |
35.70 |
| 2026-02-12 12:00 |
07:57:14.77 |
+28:46:34.0 |
HIP 38677 |
36.38 |
| 2026-02-13 00:00 |
07:56:53.15 |
+28:46:52.1 |
HIP 38677 |
33.11 |
| 2026-02-13 12:00 |
07:56:31.72 |
+28:47:08.9 |
HIP 38677 |
30.26 |
| 2026-02-14 00:00 |
07:56:10.47 |
+28:47:24.5 |
HIP 38677 |
27.91 |
| 2026-02-14 12:00 |
07:55:49.42 |
+28:47:38.8 |
HIP 38677 |
26.19 |
| 2026-02-15 00:00 |
07:55:28.56 |
+28:47:51.9 |
HIP 38677 |
25.20 |
| 2026-02-15 12:00 |
07:55:07.89 |
+28:48:03.8 |
HIP 38677 |
25.00 |
| 2026-02-16 00:00 |
07:54:47.44 |
+28:48:14.4 |
HIP 38677 |
25.59 |
| 2026-02-16 12:00 |
07:54:27.19 |
+28:48:23.8 |
HIP 38586 |
24.80 |
| 2026-02-17 00:00 |
07:54:07.15 |
+28:48:31.9 |
HIP 38586 |
24.17 |
| 2026-02-17 12:00 |
07:53:47.32 |
+28:48:38.9 |
HIP 38586 |
24.33 |
| 2026-02-18 00:00 |
07:53:27.71 |
+28:48:44.6 |
HIP 38586 |
25.25 |
| 2026-02-18 12:00 |
07:53:08.33 |
+28:48:49.1 |
HIP 38586 |
26.83 |
| 2026-02-19 00:00 |
07:52:49.17 |
+28:48:52.4 |
HIP 38391 |
25.05 |
| 2026-02-19 12:00 |
07:52:30.24 |
+28:48:54.4 |
HIP 38391 |
23.29 |
| 2026-02-20 00:00 |
07:52:11.54 |
+28:48:55.3 |
HIP 38391 |
22.21 |
| 2026-02-20 12:00 |
07:51:53.08 |
+28:48:55.0 |
HIP 38261 |
21.41 |
| 2026-02-21 00:00 |
07:51:34.86 |
+28:48:53.5 |
HIP 38261 |
17.55 |
| 2026-02-21 12:00 |
07:51:16.87 |
+28:48:50.8 |
HIP 38261 |
13.80 |
| 2026-02-22 00:00 |
07:50:59.14 |
+28:48:46.9 |
HIP 38261 |
10.24 |
| 2026-02-22 12:00 |
07:50:41.65 |
+28:48:41.8 |
HIP 38261 |
7.06 |
| 2026-02-23 00:00 |
07:50:24.41 |
+28:48:35.6 |
HIP 38261 |
4.91 |
| 2026-02-23 12:00 |
07:50:07.42 |
+28:48:28.2 |
HIP 38261 |
5.15 |
| 2026-02-24 00:00 |
07:49:50.69 |
+28:48:19.7 |
HIP 38261 |
7.48 |