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) |
| 2026-03-26 00:00 |
02:04:19.93 |
-04:22:19.7 |
HIP 9596 |
13.71 |
| 2026-03-26 12:00 |
02:04:20.91 |
-04:22:12.4 |
HIP 9596 |
13.93 |
| 2026-03-27 00:00 |
02:04:21.89 |
-04:22:05.1 |
HIP 9596 |
14.15 |
| 2026-03-27 12:00 |
02:04:22.88 |
-04:21:57.9 |
HIP 9596 |
14.37 |
| 2026-03-28 00:00 |
02:04:23.87 |
-04:21:50.7 |
HIP 9596 |
14.60 |
| 2026-03-28 12:00 |
02:04:24.87 |
-04:21:43.4 |
HIP 9596 |
14.83 |
| 2026-03-29 00:00 |
02:04:25.87 |
-04:21:36.3 |
HIP 9596 |
15.06 |
| 2026-03-29 12:00 |
02:04:26.87 |
-04:21:29.1 |
HIP 9596 |
15.30 |
| 2026-03-30 00:00 |
02:04:27.88 |
-04:21:21.9 |
HIP 9596 |
15.53 |
| 2026-03-30 12:00 |
02:04:28.89 |
-04:21:14.8 |
HIP 9596 |
15.77 |
| 2026-03-31 00:00 |
02:04:29.91 |
-04:21:07.7 |
HIP 9596 |
16.02 |
| 2026-03-31 12:00 |
02:04:30.93 |
-04:21:00.6 |
HIP 9596 |
16.26 |
| 2026-04-01 00:00 |
02:04:31.95 |
-04:20:53.5 |
HIP 9596 |
16.51 |
| 2026-04-01 12:00 |
02:04:32.98 |
-04:20:46.5 |
HIP 9596 |
16.75 |
| 2026-04-02 00:00 |
02:04:34.01 |
-04:20:39.5 |
HIP 9596 |
17.00 |
| 2026-04-02 12:00 |
02:04:35.04 |
-04:20:32.5 |
HIP 9596 |
17.26 |
| 2026-04-03 00:00 |
02:04:36.08 |
-04:20:25.5 |
HIP 9596 |
17.51 |
| 2026-04-03 12:00 |
02:04:37.12 |
-04:20:18.6 |
HIP 9596 |
17.76 |
| 2026-04-04 00:00 |
02:04:38.16 |
-04:20:11.7 |
HIP 9596 |
18.02 |
| 2026-04-04 12:00 |
02:04:39.21 |
-04:20:04.8 |
HIP 9596 |
18.28 |
| 2026-04-05 00:00 |
02:04:40.26 |
-04:19:57.9 |
HIP 9596 |
18.54 |
| 2026-04-05 12:00 |
02:04:41.31 |
-04:19:51.1 |
HIP 9596 |
18.80 |
| 2026-04-06 00:00 |
02:04:42.37 |
-04:19:44.2 |
HIP 9596 |
19.07 |
| 2026-04-06 12:00 |
02:04:43.43 |
-04:19:37.5 |
HIP 9596 |
19.33 |
| 2026-04-07 00:00 |
02:04:44.49 |
-04:19:30.7 |
HIP 9596 |
19.60 |
| 2026-04-07 12:00 |
02:04:45.55 |
-04:19:24.0 |
HIP 9596 |
19.86 |
| 2026-04-08 00:00 |
02:04:46.62 |
-04:19:17.3 |
HIP 9596 |
20.13 |
| 2026-04-08 12:00 |
02:04:47.69 |
-04:19:10.6 |
HIP 9596 |
20.40 |
| 2026-04-09 00:00 |
02:04:48.76 |
-04:19:04.0 |
HIP 9596 |
20.67 |
| 2026-04-09 12:00 |
02:04:49.83 |
-04:18:57.3 |
HIP 9596 |
20.94 |
| 2026-04-10 00:00 |
02:04:50.91 |
-04:18:50.8 |
HIP 9813 |
21.10 |
| 2026-04-10 12:00 |
02:04:51.99 |
-04:18:44.2 |
HIP 9813 |
20.85 |
| 2026-04-11 00:00 |
02:04:53.07 |
-04:18:37.7 |
HIP 9813 |
20.60 |
| 2026-04-11 12:00 |
02:04:54.15 |
-04:18:31.2 |
HIP 9813 |
20.35 |
| 2026-04-12 00:00 |
02:04:55.24 |
-04:18:24.8 |
HIP 9813 |
20.10 |
| 2026-04-12 12:00 |
02:04:56.33 |
-04:18:18.4 |
HIP 9813 |
19.85 |
| 2026-04-13 00:00 |
02:04:57.42 |
-04:18:12.0 |
HIP 9813 |
19.61 |
| 2026-04-13 12:00 |
02:04:58.51 |
-04:18:05.6 |
HIP 9813 |
19.36 |
| 2026-04-14 00:00 |
02:04:59.60 |
-04:17:59.3 |
HIP 9813 |
19.11 |
| 2026-04-14 12:00 |
02:05:00.69 |
-04:17:53.0 |
HIP 9813 |
18.87 |
| 2026-04-15 00:00 |
02:05:01.79 |
-04:17:46.8 |
HIP 9813 |
18.63 |
| 2026-04-15 12:00 |
02:05:02.89 |
-04:17:40.6 |
HIP 9813 |
18.38 |
| 2026-04-16 00:00 |
02:05:03.98 |
-04:17:34.4 |
HIP 9813 |
18.14 |