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) |
| 2026-05-12 00:00 |
04:51:44.50 |
-04:08:25.4 |
HIP 22511 |
16.68 |
| 2026-05-12 12:00 |
04:51:47.95 |
-04:08:10.9 |
HIP 22511 |
17.52 |
| 2026-05-13 00:00 |
04:51:51.41 |
-04:07:56.5 |
HIP 22511 |
18.37 |
| 2026-05-13 12:00 |
04:51:54.88 |
-04:07:42.4 |
HIP 22511 |
19.23 |
| 2026-05-14 00:00 |
04:51:58.36 |
-04:07:28.5 |
HIP 22511 |
20.10 |
| 2026-05-14 12:00 |
04:52:01.86 |
-04:07:14.7 |
HIP 22511 |
20.97 |
| 2026-05-15 00:00 |
04:52:05.36 |
-04:07:01.1 |
HIP 22511 |
21.84 |
| 2026-05-15 12:00 |
04:52:08.88 |
-04:06:47.8 |
HIP 22511 |
22.72 |
| 2026-05-16 00:00 |
04:52:12.41 |
-04:06:34.6 |
HIP 22511 |
23.61 |
| 2026-05-16 12:00 |
04:52:15.95 |
-04:06:21.6 |
HIP 22511 |
24.50 |
| 2026-05-17 00:00 |
04:52:19.49 |
-04:06:08.8 |
HIP 22511 |
25.39 |
| 2026-05-17 12:00 |
04:52:23.05 |
-04:05:56.2 |
HIP 22511 |
26.29 |
| 2026-05-18 00:00 |
04:52:26.61 |
-04:05:43.8 |
HIP 22511 |
27.18 |
| 2026-05-18 12:00 |
04:52:30.19 |
-04:05:31.7 |
HIP 22511 |
28.09 |
| 2026-05-19 00:00 |
04:52:33.77 |
-04:05:19.7 |
HIP 22511 |
28.99 |
| 2026-05-19 12:00 |
04:52:37.36 |
-04:05:07.9 |
HIP 22511 |
29.90 |
| 2026-05-20 00:00 |
04:52:40.96 |
-04:04:56.3 |
HIP 22511 |
30.81 |
| 2026-05-20 12:00 |
04:52:44.57 |
-04:04:44.9 |
HIP 22577 |
31.21 |
| 2026-05-21 00:00 |
04:52:48.18 |
-04:04:33.7 |
HIP 22577 |
31.61 |
| 2026-05-21 12:00 |
04:52:51.81 |
-04:04:22.7 |
HIP 22577 |
32.03 |
| 2026-05-22 00:00 |
04:52:55.44 |
-04:04:12.0 |
HIP 22577 |
32.47 |
| 2026-05-22 12:00 |
04:52:59.07 |
-04:04:01.4 |
HIP 22577 |
32.94 |
| 2026-05-23 00:00 |
04:53:02.71 |
-04:03:51.0 |
HIP 22577 |
33.43 |
| 2026-05-23 12:00 |
04:53:06.36 |
-04:03:40.9 |
HIP 22577 |
33.94 |
| 2026-05-24 00:00 |
04:53:10.02 |
-04:03:30.9 |
HIP 22577 |
34.47 |
| 2026-05-24 12:00 |
04:53:13.68 |
-04:03:21.2 |
HIP 22876 |
34.95 |
| 2026-05-25 00:00 |
04:53:17.35 |
-04:03:11.6 |
HIP 22876 |
34.23 |
| 2026-05-25 12:00 |
04:53:21.02 |
-04:03:02.3 |
HIP 22876 |
33.53 |
| 2026-05-26 00:00 |
04:53:24.69 |
-04:02:53.2 |
HIP 22876 |
32.82 |
| 2026-05-26 12:00 |
04:53:28.37 |
-04:02:44.2 |
HIP 22876 |
32.13 |
| 2026-05-27 00:00 |
04:53:32.06 |
-04:02:35.5 |
HIP 22876 |
31.45 |
| 2026-05-27 12:00 |
04:53:35.75 |
-04:02:27.0 |
HIP 22876 |
30.78 |
| 2026-05-28 00:00 |
04:53:39.45 |
-04:02:18.7 |
HIP 22876 |
30.12 |
| 2026-05-28 12:00 |
04:53:43.14 |
-04:02:10.7 |
HIP 22876 |
29.47 |
| 2026-05-29 00:00 |
04:53:46.85 |
-04:02:02.8 |
HIP 22876 |
28.83 |
| 2026-05-29 12:00 |
04:53:50.55 |
-04:01:55.1 |
HIP 22876 |
28.21 |
| 2026-05-30 00:00 |
04:53:54.26 |
-04:01:47.7 |
HIP 22876 |
27.60 |
| 2026-05-30 12:00 |
04:53:57.97 |
-04:01:40.4 |
HIP 22876 |
27.00 |
| 2026-05-31 00:00 |
04:54:01.69 |
-04:01:33.4 |
HIP 22876 |
26.43 |
| 2026-05-31 12:00 |
04:54:05.40 |
-04:01:26.6 |
HIP 22876 |
25.87 |
| 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 |