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 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
10:34:53.69 |
+12:38:06.2 |
HIP 51856 |
15.42 |
| 2026-09-20 12:00 |
10:35:33.00 |
+12:34:01.7 |
HIP 51856 |
6.27 |
| 2026-09-21 00:00 |
10:36:12.31 |
+12:29:56.9 |
HIP 51856 |
7.62 |
| 2026-09-21 12:00 |
10:36:51.62 |
+12:25:51.8 |
HIP 51856 |
17.16 |
| 2026-09-22 00:00 |
10:37:30.92 |
+12:21:46.5 |
HIP 51985 |
26.43 |
| 2026-09-22 12:00 |
10:38:10.21 |
+12:17:40.9 |
HIP 51985 |
25.63 |
| 2026-09-23 00:00 |
10:38:49.50 |
+12:13:35.1 |
HIP 52257 |
27.80 |
| 2026-09-23 12:00 |
10:39:28.79 |
+12:09:29.0 |
HIP 52257 |
17.42 |
| 2026-09-24 00:00 |
10:40:08.06 |
+12:05:22.6 |
HIP 52257 |
7.19 |
| 2026-09-24 12:00 |
10:40:47.33 |
+12:01:16.0 |
HIP 52257 |
4.23 |
| 2026-09-25 00:00 |
10:41:26.60 |
+11:57:09.1 |
HIP 52339 |
10.78 |
| 2026-09-25 12:00 |
10:42:05.85 |
+11:53:02.0 |
HIP 52339 |
14.12 |
| 2026-09-26 00:00 |
10:42:45.10 |
+11:48:54.7 |
HIP 52339 |
22.38 |
| 2026-09-26 12:00 |
10:43:24.34 |
+11:44:47.1 |
HIP 52525 |
28.36 |
| 2026-09-27 00:00 |
10:44:03.58 |
+11:40:39.2 |
HIP 52525 |
20.99 |
| 2026-09-27 12:00 |
10:44:42.81 |
+11:36:31.2 |
HIP 52525 |
17.19 |
| 2026-09-28 00:00 |
10:45:22.02 |
+11:32:22.9 |
HIP 52525 |
19.21 |
| 2026-09-28 12:00 |
10:46:01.24 |
+11:28:14.3 |
HIP 52707 |
19.24 |
| 2026-09-29 00:00 |
10:46:40.44 |
+11:24:05.6 |
HIP 52707 |
13.06 |
| 2026-09-29 12:00 |
10:47:19.63 |
+11:19:56.6 |
HIP 52707 |
13.78 |
| 2026-09-30 00:00 |
10:47:58.82 |
+11:15:47.4 |
HIP 52707 |
20.69 |
| 2026-09-30 12:00 |
10:48:37.99 |
+11:11:38.0 |
HIP 52707 |
29.76 |
| 2026-10-01 00:00 |
10:49:17.16 |
+11:07:28.4 |
HIP 52911 |
34.76 |
| 2026-10-01 12:00 |
10:49:56.32 |
+11:03:18.6 |
HIP 52911 |
32.20 |
| 2026-10-02 00:00 |
10:50:35.47 |
+10:59:08.5 |
HIP 53115 |
30.30 |
| 2026-10-02 12:00 |
10:51:14.60 |
+10:54:58.3 |
HIP 53115 |
28.63 |
| 2026-10-03 00:00 |
10:51:53.73 |
+10:50:47.9 |
HIP 53200 |
29.90 |
| 2026-10-03 12:00 |
10:52:32.84 |
+10:46:37.3 |
HIP 53200 |
30.94 |
| 2026-10-04 00:00 |
10:53:11.94 |
+10:42:26.5 |
HIP 53170 |
34.24 |
| 2026-10-04 12:00 |
10:53:51.04 |
+10:38:15.5 |
HIP 53170 |
34.11 |
| 2026-10-05 00:00 |
10:54:30.11 |
+10:34:04.4 |
HIP 53431 |
33.16 |
| 2026-10-05 12:00 |
10:55:09.18 |
+10:29:53.1 |
HIP 53431 |
24.68 |
| 2026-10-06 00:00 |
10:55:48.23 |
+10:25:41.6 |
HIP 53431 |
18.40 |
| 2026-10-06 12:00 |
10:56:27.27 |
+10:21:30.0 |
HIP 53431 |
16.96 |
| 2026-10-07 00:00 |
10:57:06.29 |
+10:17:18.2 |
HIP 53431 |
21.36 |
| 2026-10-07 12:00 |
10:57:45.30 |
+10:13:06.3 |
HIP 53585 |
26.16 |
| 2026-10-08 00:00 |
10:58:24.29 |
+10:08:54.2 |
HIP 53727 |
21.38 |
| 2026-10-08 12:00 |
10:59:03.27 |
+10:04:42.0 |
HIP 53727 |
11.50 |
| 2026-10-09 00:00 |
10:59:42.23 |
+10:00:29.7 |
HIP 53727 |
5.16 |
| 2026-10-09 12:00 |
11:00:21.17 |
+09:56:17.2 |
HIP 53727 |
11.85 |
| 2026-10-10 00:00 |
11:01:00.10 |
+09:52:04.6 |
HIP 53934 |
17.32 |
| 2026-10-10 12:00 |
11:01:39.00 |
+09:47:52.0 |
HIP 53934 |
9.64 |
| 2026-10-11 00:00 |
11:02:17.89 |
+09:43:39.2 |
HIP 53937 |
10.21 |