C/1949 K1 (Johnson)
メタデータ
| 項目 |
値 |
| Designation |
C/1949 K1 (Johnson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1950-01-19T07:03:40.668480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:09Z |
| Obs used |
18 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1950-10-11.0000000 |
| e |
1.00071559 |
| q (au) |
2.553079 |
| a (au) |
-3567.814459 |
| i (deg) |
131.351658 |
| Ω (om, deg) |
222.334961 |
| ω (w, deg) |
40.088783 |
| M (ma, deg) |
0.001224 |
等級
散乱 + 全体線形
$$
M_a = (3.685 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
3.685 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.998 |
| δ90 |
9.998 |
| 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 |
02:03:15.43 |
-04:34:28.1 |
HIP 9634 |
8.28 |
| 2026-02-03 12:00 |
02:03:15.63 |
-04:34:22.1 |
HIP 9634 |
8.23 |
| 2026-02-04 00:00 |
02:03:15.84 |
-04:34:16.1 |
HIP 9634 |
8.18 |
| 2026-02-04 12:00 |
02:03:16.06 |
-04:34:10.0 |
HIP 9634 |
8.14 |
| 2026-02-05 00:00 |
02:03:16.29 |
-04:34:03.8 |
HIP 9634 |
8.09 |
| 2026-02-05 12:00 |
02:03:16.53 |
-04:33:57.7 |
HIP 9634 |
8.03 |
| 2026-02-06 00:00 |
02:03:16.78 |
-04:33:51.5 |
HIP 9634 |
7.98 |
| 2026-02-06 12:00 |
02:03:17.04 |
-04:33:45.2 |
HIP 9634 |
7.93 |
| 2026-02-07 00:00 |
02:03:17.31 |
-04:33:38.9 |
HIP 9634 |
7.88 |
| 2026-02-07 12:00 |
02:03:17.59 |
-04:33:32.6 |
HIP 9634 |
7.82 |
| 2026-02-08 00:00 |
02:03:17.88 |
-04:33:26.3 |
HIP 9634 |
7.77 |
| 2026-02-08 12:00 |
02:03:18.18 |
-04:33:19.9 |
HIP 9634 |
7.71 |
| 2026-02-09 00:00 |
02:03:18.48 |
-04:33:13.4 |
HIP 9634 |
7.66 |
| 2026-02-09 12:00 |
02:03:18.80 |
-04:33:07.0 |
HIP 9634 |
7.60 |
| 2026-02-10 00:00 |
02:03:19.13 |
-04:33:00.5 |
HIP 9634 |
7.55 |
| 2026-02-10 12:00 |
02:03:19.46 |
-04:32:53.9 |
HIP 9634 |
7.49 |
| 2026-02-11 00:00 |
02:03:19.81 |
-04:32:47.4 |
HIP 9634 |
7.44 |
| 2026-02-11 12:00 |
02:03:20.17 |
-04:32:40.8 |
HIP 9634 |
7.38 |
| 2026-02-12 00:00 |
02:03:20.53 |
-04:32:34.1 |
HIP 9634 |
7.32 |
| 2026-02-12 12:00 |
02:03:20.90 |
-04:32:27.5 |
HIP 9634 |
7.27 |
| 2026-02-13 00:00 |
02:03:21.29 |
-04:32:20.8 |
HIP 9634 |
7.21 |
| 2026-02-13 12:00 |
02:03:21.68 |
-04:32:14.0 |
HIP 9634 |
7.16 |
| 2026-02-14 00:00 |
02:03:22.08 |
-04:32:07.3 |
HIP 9634 |
7.11 |
| 2026-02-14 12:00 |
02:03:22.49 |
-04:32:00.5 |
HIP 9634 |
7.05 |
| 2026-02-15 00:00 |
02:03:22.91 |
-04:31:53.6 |
HIP 9634 |
7.00 |
| 2026-02-15 12:00 |
02:03:23.34 |
-04:31:46.8 |
HIP 9634 |
6.95 |
| 2026-02-16 00:00 |
02:03:23.78 |
-04:31:39.9 |
HIP 9634 |
6.90 |
| 2026-02-16 12:00 |
02:03:24.23 |
-04:31:33.0 |
HIP 9634 |
6.85 |
| 2026-02-17 00:00 |
02:03:24.69 |
-04:31:26.1 |
HIP 9634 |
6.81 |
| 2026-02-17 12:00 |
02:03:25.15 |
-04:31:19.1 |
HIP 9634 |
6.76 |
| 2026-02-18 00:00 |
02:03:25.63 |
-04:31:12.1 |
HIP 9634 |
6.72 |
| 2026-02-18 12:00 |
02:03:26.11 |
-04:31:05.1 |
HIP 9634 |
6.68 |
| 2026-02-19 00:00 |
02:03:26.61 |
-04:30:58.1 |
HIP 9634 |
6.64 |
| 2026-02-19 12:00 |
02:03:27.11 |
-04:30:51.0 |
HIP 9634 |
6.61 |
| 2026-02-20 00:00 |
02:03:27.62 |
-04:30:44.0 |
HIP 9634 |
6.58 |
| 2026-02-20 12:00 |
02:03:28.14 |
-04:30:36.8 |
HIP 9634 |
6.55 |
| 2026-02-21 00:00 |
02:03:28.67 |
-04:30:29.7 |
HIP 9634 |
6.52 |
| 2026-02-21 12:00 |
02:03:29.20 |
-04:30:22.6 |
HIP 9634 |
6.50 |
| 2026-02-22 00:00 |
02:03:29.75 |
-04:30:15.4 |
HIP 9634 |
6.48 |
| 2026-02-22 12:00 |
02:03:30.30 |
-04:30:08.2 |
HIP 9634 |
6.47 |
| 2026-02-23 00:00 |
02:03:30.86 |
-04:30:01.0 |
HIP 9634 |
6.45 |
| 2026-02-23 12:00 |
02:03:31.43 |
-04:29:53.8 |
HIP 9634 |
6.45 |
| 2026-02-24 00:00 |
02:03:32.01 |
-04:29:46.5 |
HIP 9634 |
6.44 |