メタデータ
| 項目 |
値 |
| Designation |
C/1927 E1 (Stearns) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1927-03-22T09:38:59.971200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:02Z |
| Obs used |
17 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1927-04-28.0000000 |
| e |
1.00126512 |
| q (au) |
3.685079 |
| a (au) |
-2912.831167 |
| i (deg) |
87.689543 |
| Ω (om, deg) |
215.661674 |
| ω (w, deg) |
11.068406 |
| M (ma, deg) |
0.000229 |
等級
散乱 + 全体線形
$$
M_a = (8.109 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.109 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| δ90 |
9.945 |
| 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 |
01:59:00.08 |
+22:02:16.8 |
HIP 9260 |
7.45 |
| 2026-05-12 12:00 |
01:59:01.05 |
+22:02:22.1 |
HIP 9260 |
7.52 |
| 2026-05-13 00:00 |
01:59:02.01 |
+22:02:27.4 |
HIP 9260 |
7.61 |
| 2026-05-13 12:00 |
01:59:02.97 |
+22:02:32.7 |
HIP 9260 |
7.69 |
| 2026-05-14 00:00 |
01:59:03.93 |
+22:02:38.1 |
HIP 9260 |
7.79 |
| 2026-05-14 12:00 |
01:59:04.89 |
+22:02:43.4 |
HIP 9260 |
7.89 |
| 2026-05-15 00:00 |
01:59:05.84 |
+22:02:48.7 |
HIP 9260 |
7.99 |
| 2026-05-15 12:00 |
01:59:06.79 |
+22:02:54.1 |
HIP 9260 |
8.10 |
| 2026-05-16 00:00 |
01:59:07.73 |
+22:02:59.4 |
HIP 9260 |
8.22 |
| 2026-05-16 12:00 |
01:59:08.68 |
+22:03:04.8 |
HIP 9260 |
8.34 |
| 2026-05-17 00:00 |
01:59:09.61 |
+22:03:10.2 |
HIP 9260 |
8.47 |
| 2026-05-17 12:00 |
01:59:10.55 |
+22:03:15.5 |
HIP 9260 |
8.60 |
| 2026-05-18 00:00 |
01:59:11.48 |
+22:03:20.9 |
HIP 9260 |
8.74 |
| 2026-05-18 12:00 |
01:59:12.41 |
+22:03:26.2 |
HIP 9260 |
8.87 |
| 2026-05-19 00:00 |
01:59:13.33 |
+22:03:31.6 |
HIP 9260 |
9.02 |
| 2026-05-19 12:00 |
01:59:14.26 |
+22:03:37.0 |
HIP 9260 |
9.16 |
| 2026-05-20 00:00 |
01:59:15.17 |
+22:03:42.3 |
HIP 9260 |
9.31 |
| 2026-05-20 12:00 |
01:59:16.09 |
+22:03:47.7 |
HIP 9260 |
9.47 |
| 2026-05-21 00:00 |
01:59:17.00 |
+22:03:53.0 |
HIP 9260 |
9.62 |
| 2026-05-21 12:00 |
01:59:17.90 |
+22:03:58.4 |
HIP 9260 |
9.78 |
| 2026-05-22 00:00 |
01:59:18.80 |
+22:04:03.8 |
HIP 9260 |
9.94 |
| 2026-05-22 12:00 |
01:59:19.70 |
+22:04:09.1 |
HIP 9260 |
10.10 |
| 2026-05-23 00:00 |
01:59:20.59 |
+22:04:14.5 |
HIP 9260 |
10.26 |
| 2026-05-23 12:00 |
01:59:21.48 |
+22:04:19.8 |
HIP 9260 |
10.43 |
| 2026-05-24 00:00 |
01:59:22.37 |
+22:04:25.2 |
HIP 9260 |
10.60 |
| 2026-05-24 12:00 |
01:59:23.25 |
+22:04:30.5 |
HIP 9260 |
10.77 |
| 2026-05-25 00:00 |
01:59:24.12 |
+22:04:35.9 |
HIP 9260 |
10.94 |
| 2026-05-25 12:00 |
01:59:25.00 |
+22:04:41.2 |
HIP 9260 |
11.11 |
| 2026-05-26 00:00 |
01:59:25.86 |
+22:04:46.6 |
HIP 9260 |
11.28 |
| 2026-05-26 12:00 |
01:59:26.73 |
+22:04:51.9 |
HIP 9260 |
11.46 |
| 2026-05-27 00:00 |
01:59:27.58 |
+22:04:57.2 |
HIP 9260 |
11.63 |
| 2026-05-27 12:00 |
01:59:28.44 |
+22:05:02.5 |
HIP 9260 |
11.81 |
| 2026-05-28 00:00 |
01:59:29.29 |
+22:05:07.8 |
HIP 9260 |
11.98 |
| 2026-05-28 12:00 |
01:59:30.13 |
+22:05:13.1 |
HIP 9260 |
12.16 |
| 2026-05-29 00:00 |
01:59:30.97 |
+22:05:18.4 |
HIP 9260 |
12.34 |
| 2026-05-29 12:00 |
01:59:31.80 |
+22:05:23.7 |
HIP 9260 |
12.52 |
| 2026-05-30 00:00 |
01:59:32.63 |
+22:05:29.0 |
HIP 9260 |
12.70 |
| 2026-05-30 12:00 |
01:59:33.46 |
+22:05:34.3 |
HIP 9260 |
12.87 |
| 2026-05-31 00:00 |
01:59:34.28 |
+22:05:39.6 |
HIP 9260 |
13.05 |
| 2026-05-31 12:00 |
01:59:35.09 |
+22:05:44.8 |
HIP 9260 |
13.23 |
| 2026-06-01 00:00 |
01:59:35.90 |
+22:05:50.1 |
HIP 9260 |
13.41 |
| 2026-06-01 12:00 |
01:59:36.70 |
+22:05:55.3 |
HIP 9260 |
13.59 |
| 2026-06-02 00:00 |
01:59:37.50 |
+22:06:00.6 |
HIP 9260 |
13.77 |