メタデータ
| 項目 |
値 |
| Designation |
C/2013 K1 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-30T03:59:46.325760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:36Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
18.400 |
| K1 |
9.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-05-31.0000000 |
| e |
0.98811567 |
| q (au) |
0.948263 |
| a (au) |
79.791095 |
| i (deg) |
42.341521 |
| Ω (om, deg) |
125.908709 |
| ω (w, deg) |
171.332563 |
| M (ma, deg) |
0.001153 |
等級
散乱 + 全体線形
$$
M_a = (17.867 + 5.957\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.867 |
| n |
5.957 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
06:59:39.42 |
+05:08:06.3 |
HIP 33626 |
11.73 |
| 2026-07-29 12:00 |
06:59:43.14 |
+05:07:55.8 |
HIP 33626 |
12.48 |
| 2026-07-30 00:00 |
06:59:46.85 |
+05:07:45.1 |
HIP 33626 |
13.24 |
| 2026-07-30 12:00 |
06:59:50.55 |
+05:07:34.3 |
HIP 33626 |
14.03 |
| 2026-07-31 00:00 |
06:59:54.24 |
+05:07:23.4 |
HIP 33626 |
14.84 |
| 2026-07-31 12:00 |
06:59:57.91 |
+05:07:12.4 |
HIP 33626 |
15.65 |
| 2026-08-01 00:00 |
07:00:01.57 |
+05:07:01.2 |
HIP 33626 |
16.48 |
| 2026-08-01 12:00 |
07:00:05.22 |
+05:06:50.0 |
HIP 33626 |
17.32 |
| 2026-08-02 00:00 |
07:00:08.85 |
+05:06:38.6 |
HIP 33626 |
18.17 |
| 2026-08-02 12:00 |
07:00:12.47 |
+05:06:27.1 |
HIP 33626 |
19.02 |
| 2026-08-03 00:00 |
07:00:16.08 |
+05:06:15.5 |
HIP 33626 |
19.87 |
| 2026-08-03 12:00 |
07:00:19.67 |
+05:06:03.8 |
HIP 33626 |
20.73 |
| 2026-08-04 00:00 |
07:00:23.25 |
+05:05:51.9 |
HIP 33626 |
21.59 |
| 2026-08-04 12:00 |
07:00:26.81 |
+05:05:40.0 |
HIP 33626 |
22.45 |
| 2026-08-05 00:00 |
07:00:30.36 |
+05:05:27.9 |
HIP 33626 |
23.32 |
| 2026-08-05 12:00 |
07:00:33.89 |
+05:05:15.8 |
HIP 33854 |
23.34 |
| 2026-08-06 00:00 |
07:00:37.41 |
+05:05:03.5 |
HIP 33854 |
22.57 |
| 2026-08-06 12:00 |
07:00:40.91 |
+05:04:51.1 |
HIP 33854 |
21.81 |
| 2026-08-07 00:00 |
07:00:44.40 |
+05:04:38.6 |
HIP 33854 |
21.07 |
| 2026-08-07 12:00 |
07:00:47.87 |
+05:04:26.0 |
HIP 33854 |
20.34 |
| 2026-08-08 00:00 |
07:00:51.32 |
+05:04:13.2 |
HIP 33854 |
19.62 |
| 2026-08-08 12:00 |
07:00:54.76 |
+05:04:00.4 |
HIP 33854 |
18.92 |
| 2026-08-09 00:00 |
07:00:58.18 |
+05:03:47.5 |
HIP 33854 |
18.23 |
| 2026-08-09 12:00 |
07:01:01.58 |
+05:03:34.4 |
HIP 33854 |
17.56 |
| 2026-08-10 00:00 |
07:01:04.97 |
+05:03:21.3 |
HIP 33854 |
16.92 |
| 2026-08-10 12:00 |
07:01:08.34 |
+05:03:08.1 |
HIP 33854 |
16.29 |
| 2026-08-11 00:00 |
07:01:11.69 |
+05:02:54.7 |
HIP 33854 |
15.69 |
| 2026-08-11 12:00 |
07:01:15.02 |
+05:02:41.3 |
HIP 33854 |
15.11 |
| 2026-08-12 00:00 |
07:01:18.34 |
+05:02:27.7 |
HIP 33854 |
14.56 |
| 2026-08-12 12:00 |
07:01:21.64 |
+05:02:14.1 |
HIP 33854 |
14.04 |
| 2026-08-13 00:00 |
07:01:24.91 |
+05:02:00.3 |
HIP 33854 |
13.56 |
| 2026-08-13 12:00 |
07:01:28.17 |
+05:01:46.5 |
HIP 33854 |
13.11 |
| 2026-08-14 00:00 |
07:01:31.41 |
+05:01:32.5 |
HIP 33854 |
12.70 |
| 2026-08-14 12:00 |
07:01:34.63 |
+05:01:18.5 |
HIP 33854 |
12.34 |
| 2026-08-15 00:00 |
07:01:37.84 |
+05:01:04.4 |
HIP 33854 |
12.02 |
| 2026-08-15 12:00 |
07:01:41.02 |
+05:00:50.2 |
HIP 33854 |
11.75 |
| 2026-08-16 00:00 |
07:01:44.18 |
+05:00:35.9 |
HIP 33854 |
11.53 |
| 2026-08-16 12:00 |
07:01:47.32 |
+05:00:21.5 |
HIP 33854 |
11.37 |
| 2026-08-17 00:00 |
07:01:50.44 |
+05:00:07.0 |
HIP 33854 |
11.26 |
| 2026-08-17 12:00 |
07:01:53.54 |
+04:59:52.4 |
HIP 33854 |
11.20 |
| 2026-08-18 00:00 |
07:01:56.62 |
+04:59:37.7 |
HIP 33854 |
11.20 |
| 2026-08-18 12:00 |
07:01:59.68 |
+04:59:23.0 |
HIP 33854 |
11.25 |
| 2026-08-19 00:00 |
07:02:02.72 |
+04:59:08.2 |
HIP 33854 |
11.36 |