メタデータ
| 項目 |
値 |
| Designation |
C/2014 C2 (STEREO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-02-18T05:53:19.752000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:48Z |
| Obs used |
297 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
9.300 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-03-08.0000000 |
| e |
1.00000000 |
| q (au) |
0.512340 |
| a (au) |
- |
| i (deg) |
135.502163 |
| Ω (om, deg) |
283.347106 |
| ω (w, deg) |
56.075501 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (15.851 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.851 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2014-01-31 |
2014-02-16 |
-109.8474 |
-24.213 |
| 2014-02-19 |
2014-04-21 |
-4.4994 |
+2.124 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:54:09.12 |
-04:01:20.0 |
HIP 22876 |
25.33 |
| 2026-06-01 12:00 |
04:54:12.84 |
-04:01:13.6 |
HIP 22876 |
24.81 |
| 2026-06-02 00:00 |
04:54:16.57 |
-04:01:07.4 |
HIP 22876 |
24.31 |
| 2026-06-02 12:00 |
04:54:20.29 |
-04:01:01.5 |
HIP 22876 |
23.83 |
| 2026-06-03 00:00 |
04:54:24.02 |
-04:00:55.7 |
HIP 22876 |
23.38 |
| 2026-06-03 12:00 |
04:54:27.74 |
-04:00:50.2 |
HIP 22876 |
22.96 |
| 2026-06-04 00:00 |
04:54:31.47 |
-04:00:44.9 |
HIP 22876 |
22.56 |
| 2026-06-04 12:00 |
04:54:35.20 |
-04:00:39.7 |
HIP 22876 |
22.19 |
| 2026-06-05 00:00 |
04:54:38.93 |
-04:00:34.9 |
HIP 22876 |
21.85 |
| 2026-06-05 12:00 |
04:54:42.66 |
-04:00:30.2 |
HIP 22929 |
21.27 |
| 2026-06-06 00:00 |
04:54:46.39 |
-04:00:25.7 |
HIP 22929 |
20.36 |
| 2026-06-06 12:00 |
04:54:50.11 |
-04:00:21.5 |
HIP 22929 |
19.45 |
| 2026-06-07 00:00 |
04:54:53.84 |
-04:00:17.5 |
HIP 22929 |
18.55 |
| 2026-06-07 12:00 |
04:54:57.57 |
-04:00:13.7 |
HIP 22929 |
17.65 |
| 2026-06-08 00:00 |
04:55:01.29 |
-04:00:10.1 |
HIP 22929 |
16.76 |
| 2026-06-08 12:00 |
04:55:05.02 |
-04:00:06.7 |
HIP 22929 |
15.88 |
| 2026-06-09 00:00 |
04:55:08.74 |
-04:00:03.6 |
HIP 22929 |
15.00 |
| 2026-06-09 12:00 |
04:55:12.46 |
-04:00:00.7 |
HIP 22929 |
14.13 |
| 2026-06-10 00:00 |
04:55:16.18 |
-03:59:58.0 |
HIP 22929 |
13.27 |
| 2026-06-10 12:00 |
04:55:19.90 |
-03:59:55.5 |
HIP 22929 |
12.42 |
| 2026-06-11 00:00 |
04:55:23.62 |
-03:59:53.2 |
HIP 22929 |
11.59 |
| 2026-06-11 12:00 |
04:55:27.33 |
-03:59:51.2 |
HIP 22929 |
10.77 |
| 2026-06-12 00:00 |
04:55:31.04 |
-03:59:49.3 |
HIP 22929 |
9.98 |
| 2026-06-12 12:00 |
04:55:34.74 |
-03:59:47.7 |
HIP 22929 |
9.21 |
| 2026-06-13 00:00 |
04:55:38.45 |
-03:59:46.4 |
HIP 22929 |
8.48 |
| 2026-06-13 12:00 |
04:55:42.14 |
-03:59:45.2 |
HIP 22929 |
7.79 |
| 2026-06-14 00:00 |
04:55:45.84 |
-03:59:44.3 |
HIP 22929 |
7.17 |
| 2026-06-14 12:00 |
04:55:49.53 |
-03:59:43.6 |
HIP 22929 |
6.61 |
| 2026-06-15 00:00 |
04:55:53.21 |
-03:59:43.1 |
HIP 22929 |
6.14 |
| 2026-06-15 12:00 |
04:55:56.89 |
-03:59:42.8 |
HIP 22929 |
5.79 |
| 2026-06-16 00:00 |
04:56:00.57 |
-03:59:42.8 |
HIP 22929 |
5.58 |
| 2026-06-16 12:00 |
04:56:04.24 |
-03:59:43.0 |
HIP 22929 |
5.51 |
| 2026-06-17 00:00 |
04:56:07.90 |
-03:59:43.4 |
HIP 22929 |
5.60 |
| 2026-06-17 12:00 |
04:56:11.56 |
-03:59:44.0 |
HIP 22929 |
5.83 |
| 2026-06-18 00:00 |
04:56:15.21 |
-03:59:44.9 |
HIP 22929 |
6.19 |
| 2026-06-18 12:00 |
04:56:18.86 |
-03:59:46.0 |
HIP 22929 |
6.67 |
| 2026-06-19 00:00 |
04:56:22.50 |
-03:59:47.3 |
HIP 22929 |
7.22 |
| 2026-06-19 12:00 |
04:56:26.13 |
-03:59:48.8 |
HIP 22929 |
7.85 |
| 2026-06-20 00:00 |
04:56:29.76 |
-03:59:50.5 |
HIP 22929 |
8.52 |
| 2026-06-20 12:00 |
04:56:33.37 |
-03:59:52.5 |
HIP 22929 |
9.24 |
| 2026-06-21 00:00 |
04:56:36.98 |
-03:59:54.7 |
HIP 22929 |
9.99 |
| 2026-06-21 12:00 |
04:56:40.58 |
-03:59:57.1 |
HIP 22929 |
10.76 |
| 2026-06-22 00:00 |
04:56:44.18 |
-03:59:59.8 |
HIP 22929 |
11.55 |