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) |
| 2026-05-12 00:00 |
06:50:04.00 |
+05:05:52.4 |
HIP 32947 |
25.35 |
| 2026-05-12 12:00 |
06:50:06.69 |
+05:06:05.1 |
HIP 32947 |
24.69 |
| 2026-05-13 00:00 |
06:50:09.40 |
+05:06:17.5 |
HIP 32947 |
24.02 |
| 2026-05-13 12:00 |
06:50:12.14 |
+05:06:29.9 |
HIP 32947 |
23.36 |
| 2026-05-14 00:00 |
06:50:14.90 |
+05:06:42.1 |
HIP 32947 |
22.68 |
| 2026-05-14 12:00 |
06:50:17.68 |
+05:06:54.1 |
HIP 32947 |
22.01 |
| 2026-05-15 00:00 |
06:50:20.49 |
+05:07:06.0 |
HIP 32947 |
21.33 |
| 2026-05-15 12:00 |
06:50:23.32 |
+05:07:17.8 |
HIP 32947 |
20.65 |
| 2026-05-16 00:00 |
06:50:26.18 |
+05:07:29.4 |
HIP 32947 |
19.96 |
| 2026-05-16 12:00 |
06:50:29.06 |
+05:07:40.9 |
HIP 32947 |
19.28 |
| 2026-05-17 00:00 |
06:50:31.96 |
+05:07:52.2 |
HIP 32947 |
18.59 |
| 2026-05-17 12:00 |
06:50:34.89 |
+05:08:03.4 |
HIP 32947 |
17.90 |
| 2026-05-18 00:00 |
06:50:37.84 |
+05:08:14.4 |
HIP 32947 |
17.21 |
| 2026-05-18 12:00 |
06:50:40.81 |
+05:08:25.3 |
HIP 32947 |
16.52 |
| 2026-05-19 00:00 |
06:50:43.80 |
+05:08:36.1 |
HIP 32947 |
15.83 |
| 2026-05-19 12:00 |
06:50:46.81 |
+05:08:46.7 |
HIP 32947 |
15.14 |
| 2026-05-20 00:00 |
06:50:49.85 |
+05:08:57.1 |
HIP 32947 |
14.45 |
| 2026-05-20 12:00 |
06:50:52.91 |
+05:09:07.4 |
HIP 32947 |
13.77 |
| 2026-05-21 00:00 |
06:50:55.98 |
+05:09:17.6 |
HIP 32947 |
13.09 |
| 2026-05-21 12:00 |
06:50:59.08 |
+05:09:27.6 |
HIP 32947 |
12.42 |
| 2026-05-22 00:00 |
06:51:02.20 |
+05:09:37.4 |
HIP 32947 |
11.76 |
| 2026-05-22 12:00 |
06:51:05.34 |
+05:09:47.1 |
HIP 32947 |
11.11 |
| 2026-05-23 00:00 |
06:51:08.51 |
+05:09:56.7 |
HIP 32947 |
10.48 |
| 2026-05-23 12:00 |
06:51:11.69 |
+05:10:06.1 |
HIP 32947 |
9.87 |
| 2026-05-24 00:00 |
06:51:14.89 |
+05:10:15.3 |
HIP 32947 |
9.27 |
| 2026-05-24 12:00 |
06:51:18.11 |
+05:10:24.4 |
HIP 32947 |
8.71 |
| 2026-05-25 00:00 |
06:51:21.35 |
+05:10:33.3 |
HIP 32947 |
8.19 |
| 2026-05-25 12:00 |
06:51:24.60 |
+05:10:42.1 |
HIP 32947 |
7.71 |
| 2026-05-26 00:00 |
06:51:27.88 |
+05:10:50.8 |
HIP 32947 |
7.30 |
| 2026-05-26 12:00 |
06:51:31.18 |
+05:10:59.3 |
HIP 32947 |
6.95 |
| 2026-05-27 00:00 |
06:51:34.49 |
+05:11:07.6 |
HIP 32947 |
6.68 |
| 2026-05-27 12:00 |
06:51:37.82 |
+05:11:15.8 |
HIP 32947 |
6.51 |
| 2026-05-28 00:00 |
06:51:41.17 |
+05:11:23.8 |
HIP 32947 |
6.43 |
| 2026-05-28 12:00 |
06:51:44.54 |
+05:11:31.7 |
HIP 32947 |
6.47 |
| 2026-05-29 00:00 |
06:51:47.92 |
+05:11:39.4 |
HIP 32947 |
6.61 |
| 2026-05-29 12:00 |
06:51:51.33 |
+05:11:47.0 |
HIP 32947 |
6.86 |
| 2026-05-30 00:00 |
06:51:54.75 |
+05:11:54.4 |
HIP 32947 |
7.20 |
| 2026-05-30 12:00 |
06:51:58.18 |
+05:12:01.7 |
HIP 32947 |
7.62 |
| 2026-05-31 00:00 |
06:52:01.64 |
+05:12:08.8 |
HIP 32997 |
7.48 |
| 2026-05-31 12:00 |
06:52:05.11 |
+05:12:15.8 |
HIP 32997 |
6.76 |
| 2026-06-01 00:00 |
06:52:08.59 |
+05:12:22.6 |
HIP 32997 |
6.08 |
| 2026-06-01 12:00 |
06:52:12.09 |
+05:12:29.2 |
HIP 32997 |
5.46 |
| 2026-06-02 00:00 |
06:52:15.61 |
+05:12:35.7 |
HIP 32997 |
4.90 |