C/2012 H2 (McNaught)
メタデータ
| 項目 |
値 |
| Designation |
C/2012 H2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-05-03T17:33:48.790080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:07Z |
| Obs used |
40 |
| NEO |
- |
| M1 |
15.700 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-05-18.0000000 |
| e |
0.89360944 |
| q (au) |
1.716772 |
| a (au) |
16.136509 |
| i (deg) |
92.835585 |
| Ω (om, deg) |
184.135948 |
| ω (w, deg) |
295.901982 |
| M (ma, deg) |
0.216949 |
等級
散乱 + 全体線形
$$
M_a = (15.847 + 4.598\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.847 |
| n |
4.598 |
| gf |
1.000 |
| gb |
-0.576 |
| 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) |
| 2026-02-03 00:00 |
19:59:45.18 |
+65:27:00.0 |
HIP 98403 |
14.17 |
| 2026-02-03 12:00 |
19:59:57.60 |
+65:27:19.7 |
HIP 98403 |
14.61 |
| 2026-02-04 00:00 |
20:00:09.98 |
+65:27:40.0 |
HIP 98403 |
15.16 |
| 2026-02-04 12:00 |
20:00:22.34 |
+65:28:00.8 |
HIP 98403 |
15.82 |
| 2026-02-05 00:00 |
20:00:34.67 |
+65:28:22.2 |
HIP 98403 |
16.57 |
| 2026-02-05 12:00 |
20:00:46.97 |
+65:28:44.2 |
HIP 98403 |
17.39 |
| 2026-02-06 00:00 |
20:00:59.24 |
+65:29:06.7 |
HIP 98403 |
18.28 |
| 2026-02-06 12:00 |
20:01:11.48 |
+65:29:29.8 |
HIP 98403 |
19.23 |
| 2026-02-07 00:00 |
20:01:23.69 |
+65:29:53.4 |
HIP 98403 |
20.23 |
| 2026-02-07 12:00 |
20:01:35.87 |
+65:30:17.6 |
HIP 98403 |
21.27 |
| 2026-02-08 00:00 |
20:01:48.02 |
+65:30:42.4 |
HIP 98403 |
22.34 |
| 2026-02-08 12:00 |
20:02:00.13 |
+65:31:07.6 |
HIP 98632 |
22.32 |
| 2026-02-09 00:00 |
20:02:12.21 |
+65:31:33.5 |
HIP 98632 |
21.93 |
| 2026-02-09 12:00 |
20:02:24.26 |
+65:31:59.9 |
HIP 98632 |
21.61 |
| 2026-02-10 00:00 |
20:02:36.28 |
+65:32:26.8 |
HIP 98632 |
21.36 |
| 2026-02-10 12:00 |
20:02:48.25 |
+65:32:54.3 |
HIP 98632 |
21.18 |
| 2026-02-11 00:00 |
20:03:00.20 |
+65:33:22.4 |
HIP 98632 |
21.06 |
| 2026-02-11 12:00 |
20:03:12.10 |
+65:33:51.0 |
HIP 99027 |
20.39 |
| 2026-02-12 00:00 |
20:03:23.97 |
+65:34:20.1 |
HIP 99027 |
19.07 |
| 2026-02-12 12:00 |
20:03:35.81 |
+65:34:49.7 |
HIP 99027 |
17.76 |
| 2026-02-13 00:00 |
20:03:47.60 |
+65:35:19.9 |
HIP 99027 |
16.44 |
| 2026-02-13 12:00 |
20:03:59.35 |
+65:35:50.7 |
HIP 99027 |
15.12 |
| 2026-02-14 00:00 |
20:04:11.07 |
+65:36:21.9 |
HIP 99027 |
13.80 |
| 2026-02-14 12:00 |
20:04:22.74 |
+65:36:53.7 |
HIP 99027 |
12.49 |
| 2026-02-15 00:00 |
20:04:34.37 |
+65:37:26.1 |
HIP 99027 |
11.17 |
| 2026-02-15 12:00 |
20:04:45.97 |
+65:37:58.9 |
HIP 99027 |
9.86 |
| 2026-02-16 00:00 |
20:04:57.51 |
+65:38:32.3 |
HIP 99027 |
8.54 |
| 2026-02-16 12:00 |
20:05:09.02 |
+65:39:06.2 |
HIP 99027 |
7.23 |
| 2026-02-17 00:00 |
20:05:20.48 |
+65:39:40.6 |
HIP 99027 |
5.92 |
| 2026-02-17 12:00 |
20:05:31.90 |
+65:40:15.6 |
HIP 99027 |
4.61 |
| 2026-02-18 00:00 |
20:05:43.27 |
+65:40:51.0 |
HIP 99027 |
3.31 |
| 2026-02-18 12:00 |
20:05:54.60 |
+65:41:27.0 |
HIP 99027 |
2.03 |
| 2026-02-19 00:00 |
20:06:05.88 |
+65:42:03.4 |
HIP 99027 |
0.84 |
| 2026-02-19 12:00 |
20:06:17.11 |
+65:42:40.4 |
HIP 99027 |
0.87 |
| 2026-02-20 00:00 |
20:06:28.29 |
+65:43:17.9 |
HIP 99027 |
2.06 |
| 2026-02-20 12:00 |
20:06:39.43 |
+65:43:55.9 |
HIP 99027 |
3.34 |
| 2026-02-21 00:00 |
20:06:50.51 |
+65:44:34.4 |
HIP 99027 |
4.63 |
| 2026-02-21 12:00 |
20:07:01.55 |
+65:45:13.3 |
HIP 99027 |
5.94 |
| 2026-02-22 00:00 |
20:07:12.54 |
+65:45:52.8 |
HIP 99027 |
7.24 |
| 2026-02-22 12:00 |
20:07:23.47 |
+65:46:32.7 |
HIP 99027 |
8.54 |
| 2026-02-23 00:00 |
20:07:34.35 |
+65:47:13.2 |
HIP 99027 |
9.85 |
| 2026-02-23 12:00 |
20:07:45.18 |
+65:47:54.1 |
HIP 99027 |
11.15 |
| 2026-02-24 00:00 |
20:07:55.96 |
+65:48:35.5 |
HIP 99027 |
12.45 |