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
$$
M_a = (8.108 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.108 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.998 |
| 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) |
| 2026-09-20 00:00 |
01:59:32.68 |
+22:12:24.9 |
HIP 9260 |
18.89 |
| 2026-09-20 12:00 |
01:59:31.84 |
+22:12:21.8 |
HIP 9260 |
18.77 |
| 2026-09-21 00:00 |
01:59:30.99 |
+22:12:18.7 |
HIP 9260 |
18.65 |
| 2026-09-21 12:00 |
01:59:30.14 |
+22:12:15.4 |
HIP 9260 |
18.53 |
| 2026-09-22 00:00 |
01:59:29.28 |
+22:12:12.2 |
HIP 9260 |
18.41 |
| 2026-09-22 12:00 |
01:59:28.42 |
+22:12:08.9 |
HIP 9260 |
18.29 |
| 2026-09-23 00:00 |
01:59:27.55 |
+22:12:05.6 |
HIP 9260 |
18.18 |
| 2026-09-23 12:00 |
01:59:26.68 |
+22:12:02.2 |
HIP 9260 |
18.06 |
| 2026-09-24 00:00 |
01:59:25.81 |
+22:11:58.8 |
HIP 9260 |
17.94 |
| 2026-09-24 12:00 |
01:59:24.93 |
+22:11:55.3 |
HIP 9260 |
17.83 |
| 2026-09-25 00:00 |
01:59:24.04 |
+22:11:51.8 |
HIP 9260 |
17.71 |
| 2026-09-25 12:00 |
01:59:23.15 |
+22:11:48.2 |
HIP 9260 |
17.60 |
| 2026-09-26 00:00 |
01:59:22.26 |
+22:11:44.6 |
HIP 9260 |
17.49 |
| 2026-09-26 12:00 |
01:59:21.36 |
+22:11:41.0 |
HIP 9260 |
17.38 |
| 2026-09-27 00:00 |
01:59:20.46 |
+22:11:37.3 |
HIP 9260 |
17.27 |
| 2026-09-27 12:00 |
01:59:19.55 |
+22:11:33.6 |
HIP 9260 |
17.16 |
| 2026-09-28 00:00 |
01:59:18.64 |
+22:11:29.8 |
HIP 9260 |
17.05 |
| 2026-09-28 12:00 |
01:59:17.73 |
+22:11:26.0 |
HIP 9260 |
16.94 |
| 2026-09-29 00:00 |
01:59:16.81 |
+22:11:22.2 |
HIP 9260 |
16.84 |
| 2026-09-29 12:00 |
01:59:15.89 |
+22:11:18.3 |
HIP 9260 |
16.73 |
| 2026-09-30 00:00 |
01:59:14.96 |
+22:11:14.4 |
HIP 9260 |
16.63 |
| 2026-09-30 12:00 |
01:59:14.03 |
+22:11:10.4 |
HIP 9260 |
16.53 |
| 2026-10-01 00:00 |
01:59:13.09 |
+22:11:06.4 |
HIP 9260 |
16.43 |
| 2026-10-01 12:00 |
01:59:12.16 |
+22:11:02.4 |
HIP 9260 |
16.33 |
| 2026-10-02 00:00 |
01:59:11.21 |
+22:10:58.3 |
HIP 9260 |
16.24 |
| 2026-10-02 12:00 |
01:59:10.27 |
+22:10:54.2 |
HIP 9260 |
16.15 |
| 2026-10-03 00:00 |
01:59:09.32 |
+22:10:50.0 |
HIP 9260 |
16.05 |
| 2026-10-03 12:00 |
01:59:08.37 |
+22:10:45.8 |
HIP 9260 |
15.96 |
| 2026-10-04 00:00 |
01:59:07.41 |
+22:10:41.6 |
HIP 9260 |
15.88 |
| 2026-10-04 12:00 |
01:59:06.45 |
+22:10:37.3 |
HIP 9260 |
15.79 |
| 2026-10-05 00:00 |
01:59:05.49 |
+22:10:33.0 |
HIP 9260 |
15.71 |
| 2026-10-05 12:00 |
01:59:04.52 |
+22:10:28.6 |
HIP 9260 |
15.63 |
| 2026-10-06 00:00 |
01:59:03.55 |
+22:10:24.2 |
HIP 9260 |
15.55 |
| 2026-10-06 12:00 |
01:59:02.58 |
+22:10:19.8 |
HIP 9260 |
15.48 |
| 2026-10-07 00:00 |
01:59:01.61 |
+22:10:15.3 |
HIP 9260 |
15.40 |
| 2026-10-07 12:00 |
01:59:00.63 |
+22:10:10.8 |
HIP 9260 |
15.33 |
| 2026-10-08 00:00 |
01:58:59.65 |
+22:10:06.3 |
HIP 9260 |
15.27 |
| 2026-10-08 12:00 |
01:58:58.67 |
+22:10:01.7 |
HIP 9260 |
15.20 |
| 2026-10-09 00:00 |
01:58:57.68 |
+22:09:57.1 |
HIP 9260 |
15.14 |
| 2026-10-09 12:00 |
01:58:56.69 |
+22:09:52.4 |
HIP 9260 |
15.08 |
| 2026-10-10 00:00 |
01:58:55.70 |
+22:09:47.7 |
HIP 9260 |
15.03 |
| 2026-10-10 12:00 |
01:58:54.71 |
+22:09:43.0 |
HIP 9260 |
14.98 |
| 2026-10-11 00:00 |
01:58:53.71 |
+22:09:38.3 |
HIP 9260 |
14.93 |