メタデータ
| 項目 |
値 |
| Designation |
C/1991 Q1 (McNaught-Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-05-03T10:52:23.122560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
5.000 |
| K1 |
15.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-08-12.0000000 |
| e |
0.99448867 |
| q (au) |
3.193967 |
| a (au) |
579.527657 |
| i (deg) |
90.506206 |
| Ω (om, deg) |
120.462895 |
| ω (w, deg) |
257.232969 |
| M (ma, deg) |
0.007103 |
等級
散乱 + 全体線形
$$
M_a = (13.015 + 2.500\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.015 |
| n |
2.500 |
| gf |
0.998 |
| gb |
-0.876 |
| k |
0.968 |
| δ90 |
9.995 |
| 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 |
09:54:53.94 |
+66:56:56.3 |
HIP 48834 |
19.73 |
| 2026-09-20 12:00 |
09:54:58.36 |
+66:57:05.5 |
HIP 48834 |
19.46 |
| 2026-09-21 00:00 |
09:55:02.76 |
+66:57:15.0 |
HIP 48834 |
19.19 |
| 2026-09-21 12:00 |
09:55:07.14 |
+66:57:24.6 |
HIP 48834 |
18.94 |
| 2026-09-22 00:00 |
09:55:11.50 |
+66:57:34.5 |
HIP 48834 |
18.69 |
| 2026-09-22 12:00 |
09:55:15.84 |
+66:57:44.6 |
HIP 48834 |
18.46 |
| 2026-09-23 00:00 |
09:55:20.16 |
+66:57:54.9 |
HIP 48834 |
18.24 |
| 2026-09-23 12:00 |
09:55:24.45 |
+66:58:05.3 |
HIP 48834 |
18.04 |
| 2026-09-24 00:00 |
09:55:28.72 |
+66:58:16.0 |
HIP 48834 |
17.84 |
| 2026-09-24 12:00 |
09:55:32.97 |
+66:58:26.9 |
HIP 48834 |
17.67 |
| 2026-09-25 00:00 |
09:55:37.20 |
+66:58:38.1 |
HIP 48834 |
17.50 |
| 2026-09-25 12:00 |
09:55:41.40 |
+66:58:49.4 |
HIP 48899 |
17.08 |
| 2026-09-26 00:00 |
09:55:45.58 |
+66:59:00.9 |
HIP 48899 |
16.64 |
| 2026-09-26 12:00 |
09:55:49.74 |
+66:59:12.6 |
HIP 48899 |
16.20 |
| 2026-09-27 00:00 |
09:55:53.87 |
+66:59:24.5 |
HIP 48899 |
15.76 |
| 2026-09-27 12:00 |
09:55:57.98 |
+66:59:36.6 |
HIP 48899 |
15.32 |
| 2026-09-28 00:00 |
09:56:02.06 |
+66:59:48.9 |
HIP 48899 |
14.88 |
| 2026-09-28 12:00 |
09:56:06.12 |
+67:00:01.5 |
HIP 48899 |
14.45 |
| 2026-09-29 00:00 |
09:56:10.15 |
+67:00:14.2 |
HIP 48899 |
14.01 |
| 2026-09-29 12:00 |
09:56:14.16 |
+67:00:27.1 |
HIP 48899 |
13.59 |
| 2026-09-30 00:00 |
09:56:18.14 |
+67:00:40.2 |
HIP 48899 |
13.16 |
| 2026-09-30 12:00 |
09:56:22.10 |
+67:00:53.6 |
HIP 48899 |
12.74 |
| 2026-10-01 00:00 |
09:56:26.03 |
+67:01:07.1 |
HIP 48899 |
12.32 |
| 2026-10-01 12:00 |
09:56:29.94 |
+67:01:20.8 |
HIP 48899 |
11.90 |
| 2026-10-02 00:00 |
09:56:33.81 |
+67:01:34.7 |
HIP 48899 |
11.49 |
| 2026-10-02 12:00 |
09:56:37.67 |
+67:01:48.8 |
HIP 48899 |
11.09 |
| 2026-10-03 00:00 |
09:56:41.49 |
+67:02:03.1 |
HIP 48899 |
10.69 |
| 2026-10-03 12:00 |
09:56:45.29 |
+67:02:17.6 |
HIP 48899 |
10.29 |
| 2026-10-04 00:00 |
09:56:49.05 |
+67:02:32.3 |
HIP 48899 |
9.90 |
| 2026-10-04 12:00 |
09:56:52.80 |
+67:02:47.2 |
HIP 48899 |
9.52 |
| 2026-10-05 00:00 |
09:56:56.51 |
+67:03:02.3 |
HIP 48899 |
9.15 |
| 2026-10-05 12:00 |
09:57:00.19 |
+67:03:17.6 |
HIP 48899 |
8.79 |
| 2026-10-06 00:00 |
09:57:03.85 |
+67:03:33.1 |
HIP 48899 |
8.44 |
| 2026-10-06 12:00 |
09:57:07.47 |
+67:03:48.8 |
HIP 48899 |
8.09 |
| 2026-10-07 00:00 |
09:57:11.07 |
+67:04:04.6 |
HIP 48899 |
7.77 |
| 2026-10-07 12:00 |
09:57:14.63 |
+67:04:20.7 |
HIP 48899 |
7.45 |
| 2026-10-08 00:00 |
09:57:18.17 |
+67:04:36.9 |
HIP 48899 |
7.16 |
| 2026-10-08 12:00 |
09:57:21.67 |
+67:04:53.4 |
HIP 48899 |
6.88 |
| 2026-10-09 00:00 |
09:57:25.15 |
+67:05:10.0 |
HIP 48899 |
6.63 |
| 2026-10-09 12:00 |
09:57:28.59 |
+67:05:26.8 |
HIP 48899 |
6.39 |
| 2026-10-10 00:00 |
09:57:32.00 |
+67:05:43.8 |
HIP 48899 |
6.19 |
| 2026-10-10 12:00 |
09:57:35.38 |
+67:06:01.0 |
HIP 48899 |
6.01 |
| 2026-10-11 00:00 |
09:57:38.73 |
+67:06:18.3 |
HIP 48899 |
5.87 |