C/1991 C3 (McNaught-Russell)
メタデータ
| 項目 |
値 |
| Designation |
C/1991 C3 (McNaught-Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-10-18T13:20:57.874560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1991-06-24.0000000 |
| e |
1.00249603 |
| q (au) |
4.777706 |
| a (au) |
-1914.125633 |
| i (deg) |
113.443762 |
| Ω (om, deg) |
161.705796 |
| ω (w, deg) |
320.929727 |
| M (ma, deg) |
0.002924 |
等級
散乱 + 全体線形
$$
M_a = (9.686 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.686 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.502 |
| 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 |
23:00:00.04 |
+64:35:27.8 |
HIP 113289 |
24.18 |
| 2026-02-03 12:00 |
23:00:04.04 |
+64:35:14.3 |
HIP 113289 |
24.52 |
| 2026-02-04 00:00 |
23:00:08.06 |
+64:35:01.0 |
HIP 113871 |
24.60 |
| 2026-02-04 12:00 |
23:00:12.10 |
+64:34:48.0 |
HIP 113871 |
24.31 |
| 2026-02-05 00:00 |
23:00:16.15 |
+64:34:35.2 |
HIP 113871 |
24.02 |
| 2026-02-05 12:00 |
23:00:20.22 |
+64:34:22.6 |
HIP 113871 |
23.73 |
| 2026-02-06 00:00 |
23:00:24.31 |
+64:34:10.4 |
HIP 113871 |
23.44 |
| 2026-02-06 12:00 |
23:00:28.41 |
+64:33:58.3 |
HIP 113871 |
23.16 |
| 2026-02-07 00:00 |
23:00:32.53 |
+64:33:46.5 |
HIP 113871 |
22.87 |
| 2026-02-07 12:00 |
23:00:36.67 |
+64:33:35.0 |
HIP 113871 |
22.60 |
| 2026-02-08 00:00 |
23:00:40.82 |
+64:33:23.7 |
HIP 113871 |
22.32 |
| 2026-02-08 12:00 |
23:00:44.99 |
+64:33:12.6 |
HIP 113871 |
22.05 |
| 2026-02-09 00:00 |
23:00:49.17 |
+64:33:01.8 |
HIP 113871 |
21.78 |
| 2026-02-09 12:00 |
23:00:53.37 |
+64:32:51.3 |
HIP 113871 |
21.52 |
| 2026-02-10 00:00 |
23:00:57.58 |
+64:32:41.0 |
HIP 113871 |
21.26 |
| 2026-02-10 12:00 |
23:01:01.81 |
+64:32:30.9 |
HIP 113871 |
21.00 |
| 2026-02-11 00:00 |
23:01:06.05 |
+64:32:21.2 |
HIP 113871 |
20.75 |
| 2026-02-11 12:00 |
23:01:10.30 |
+64:32:11.6 |
HIP 113871 |
20.50 |
| 2026-02-12 00:00 |
23:01:14.57 |
+64:32:02.3 |
HIP 113871 |
20.25 |
| 2026-02-12 12:00 |
23:01:18.85 |
+64:31:53.3 |
HIP 113871 |
20.01 |
| 2026-02-13 00:00 |
23:01:23.14 |
+64:31:44.5 |
HIP 113871 |
19.78 |
| 2026-02-13 12:00 |
23:01:27.45 |
+64:31:36.0 |
HIP 113871 |
19.55 |
| 2026-02-14 00:00 |
23:01:31.76 |
+64:31:27.8 |
HIP 113871 |
19.33 |
| 2026-02-14 12:00 |
23:01:36.09 |
+64:31:19.7 |
HIP 113871 |
19.11 |
| 2026-02-15 00:00 |
23:01:40.43 |
+64:31:12.0 |
HIP 113871 |
18.89 |
| 2026-02-15 12:00 |
23:01:44.79 |
+64:31:04.5 |
HIP 113871 |
18.69 |
| 2026-02-16 00:00 |
23:01:49.15 |
+64:30:57.3 |
HIP 113871 |
18.49 |
| 2026-02-16 12:00 |
23:01:53.52 |
+64:30:50.3 |
HIP 113871 |
18.29 |
| 2026-02-17 00:00 |
23:01:57.91 |
+64:30:43.6 |
HIP 113871 |
18.10 |
| 2026-02-17 12:00 |
23:02:02.30 |
+64:30:37.1 |
HIP 113871 |
17.92 |
| 2026-02-18 00:00 |
23:02:06.70 |
+64:30:30.9 |
HIP 113871 |
17.75 |
| 2026-02-18 12:00 |
23:02:11.11 |
+64:30:25.0 |
HIP 113871 |
17.58 |
| 2026-02-19 00:00 |
23:02:15.53 |
+64:30:19.3 |
HIP 113871 |
17.42 |
| 2026-02-19 12:00 |
23:02:19.96 |
+64:30:13.8 |
HIP 113871 |
17.27 |
| 2026-02-20 00:00 |
23:02:24.40 |
+64:30:08.7 |
HIP 113871 |
17.13 |
| 2026-02-20 12:00 |
23:02:28.85 |
+64:30:03.8 |
HIP 113871 |
16.99 |
| 2026-02-21 00:00 |
23:02:33.30 |
+64:29:59.1 |
HIP 113871 |
16.87 |
| 2026-02-21 12:00 |
23:02:37.76 |
+64:29:54.7 |
HIP 113871 |
16.75 |
| 2026-02-22 00:00 |
23:02:42.23 |
+64:29:50.6 |
HIP 113871 |
16.64 |
| 2026-02-22 12:00 |
23:02:46.70 |
+64:29:46.7 |
HIP 113871 |
16.54 |
| 2026-02-23 00:00 |
23:02:51.18 |
+64:29:43.1 |
HIP 113871 |
16.45 |
| 2026-02-23 12:00 |
23:02:55.67 |
+64:29:39.7 |
HIP 113871 |
16.37 |
| 2026-02-24 00:00 |
23:03:00.16 |
+64:29:36.6 |
HIP 113871 |
16.30 |