C/2007 K4 (Gibbs)
メタデータ
| 項目 |
値 |
| Designation |
C/2007 K4 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-05-03T17:12:48.067200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:08Z |
| Obs used |
95 |
| NEO |
- |
| M1 |
11.900 |
| 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) |
2007-06-13.0000000 |
| e |
1.00297142 |
| q (au) |
3.527848 |
| a (au) |
-1187.258376 |
| i (deg) |
98.626550 |
| Ω (om, deg) |
68.516312 |
| ω (w, deg) |
162.413892 |
| M (ma, deg) |
0.000971 |
等級
散乱 + 全体線形
$$
M_a = (9.288 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.288 |
| n |
6.000 |
| gf |
0.992 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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 |
05:27:18.87 |
-30:43:35.9 |
HIP 25408 |
16.15 |
| 2026-02-03 12:00 |
05:27:16.38 |
-30:43:02.1 |
HIP 25408 |
15.52 |
| 2026-02-04 00:00 |
05:27:13.92 |
-30:42:28.1 |
HIP 25408 |
14.91 |
| 2026-02-04 12:00 |
05:27:11.49 |
-30:41:53.9 |
HIP 25408 |
14.32 |
| 2026-02-05 00:00 |
05:27:09.09 |
-30:41:19.5 |
HIP 25408 |
13.76 |
| 2026-02-05 12:00 |
05:27:06.72 |
-30:40:44.9 |
HIP 25408 |
13.22 |
| 2026-02-06 00:00 |
05:27:04.37 |
-30:40:10.1 |
HIP 25408 |
12.72 |
| 2026-02-06 12:00 |
05:27:02.05 |
-30:39:35.1 |
HIP 25408 |
12.24 |
| 2026-02-07 00:00 |
05:26:59.76 |
-30:38:59.8 |
HIP 25408 |
11.81 |
| 2026-02-07 12:00 |
05:26:57.50 |
-30:38:24.4 |
HIP 25408 |
11.41 |
| 2026-02-08 00:00 |
05:26:55.27 |
-30:37:48.7 |
HIP 25408 |
11.06 |
| 2026-02-08 12:00 |
05:26:53.06 |
-30:37:12.9 |
HIP 25408 |
10.76 |
| 2026-02-09 00:00 |
05:26:50.89 |
-30:36:36.9 |
HIP 25408 |
10.52 |
| 2026-02-09 12:00 |
05:26:48.75 |
-30:36:00.7 |
HIP 25408 |
10.33 |
| 2026-02-10 00:00 |
05:26:46.63 |
-30:35:24.3 |
HIP 25408 |
10.20 |
| 2026-02-10 12:00 |
05:26:44.54 |
-30:34:47.7 |
HIP 25408 |
10.14 |
| 2026-02-11 00:00 |
05:26:42.49 |
-30:34:10.9 |
HIP 25408 |
10.13 |
| 2026-02-11 12:00 |
05:26:40.46 |
-30:33:33.9 |
HIP 25408 |
10.20 |
| 2026-02-12 00:00 |
05:26:38.47 |
-30:32:56.8 |
HIP 25408 |
10.32 |
| 2026-02-12 12:00 |
05:26:36.50 |
-30:32:19.5 |
HIP 25408 |
10.50 |
| 2026-02-13 00:00 |
05:26:34.57 |
-30:31:42.0 |
HIP 25408 |
10.74 |
| 2026-02-13 12:00 |
05:26:32.66 |
-30:31:04.4 |
HIP 25408 |
11.02 |
| 2026-02-14 00:00 |
05:26:30.79 |
-30:30:26.6 |
HIP 25408 |
11.36 |
| 2026-02-14 12:00 |
05:26:28.94 |
-30:29:48.6 |
HIP 25408 |
11.74 |
| 2026-02-15 00:00 |
05:26:27.13 |
-30:29:10.5 |
HIP 25408 |
12.16 |
| 2026-02-15 12:00 |
05:26:25.35 |
-30:28:32.2 |
HIP 25408 |
12.61 |
| 2026-02-16 00:00 |
05:26:23.60 |
-30:27:53.7 |
HIP 25408 |
13.10 |
| 2026-02-16 12:00 |
05:26:21.88 |
-30:27:15.2 |
HIP 25408 |
13.61 |
| 2026-02-17 00:00 |
05:26:20.19 |
-30:26:36.4 |
HIP 25408 |
14.15 |
| 2026-02-17 12:00 |
05:26:18.53 |
-30:25:57.5 |
HIP 25408 |
14.71 |
| 2026-02-18 00:00 |
05:26:16.90 |
-30:25:18.5 |
HIP 25408 |
15.28 |
| 2026-02-18 12:00 |
05:26:15.31 |
-30:24:39.4 |
HIP 25408 |
15.88 |
| 2026-02-19 00:00 |
05:26:13.75 |
-30:24:00.1 |
HIP 25408 |
16.49 |
| 2026-02-19 12:00 |
05:26:12.22 |
-30:23:20.6 |
HIP 25408 |
17.11 |
| 2026-02-20 00:00 |
05:26:10.72 |
-30:22:41.1 |
HIP 25408 |
17.74 |
| 2026-02-20 12:00 |
05:26:09.25 |
-30:22:01.4 |
HIP 25355 |
18.14 |
| 2026-02-21 00:00 |
05:26:07.82 |
-30:21:21.6 |
HIP 25355 |
18.51 |
| 2026-02-21 12:00 |
05:26:06.41 |
-30:20:41.7 |
HIP 25355 |
18.92 |
| 2026-02-22 00:00 |
05:26:05.04 |
-30:20:01.7 |
HIP 25355 |
19.34 |
| 2026-02-22 12:00 |
05:26:03.70 |
-30:19:21.5 |
HIP 25355 |
19.79 |
| 2026-02-23 00:00 |
05:26:02.40 |
-30:18:41.3 |
HIP 25355 |
20.26 |
| 2026-02-23 12:00 |
05:26:01.12 |
-30:18:00.9 |
HIP 25355 |
20.75 |
| 2026-02-24 00:00 |
05:25:59.88 |
-30:17:20.4 |
HIP 25355 |
21.26 |