メタデータ
| 項目 |
値 |
| Designation |
C/1947 S1 (Bester) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1948-02-16T10:08:20.811840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:07Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1948-01-07.0000000 |
| e |
1.00034321 |
| q (au) |
0.748130 |
| a (au) |
-2179.799629 |
| i (deg) |
140.568676 |
| Ω (om, deg) |
271.438753 |
| ω (w, deg) |
350.213543 |
| M (ma, deg) |
-0.000391 |
等級
散乱 + 全体線形
$$
M_a = (6.180 + 3.781\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.180 |
| n |
3.781 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.952 |
| δ90 |
1.000 |
| 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 |
| 1947-10-05 |
1948-01-12 |
+0.4348 |
-0.045 |
| 1948-02-28 |
1948-05-08 |
-2.2957 |
+0.187 |
| 1948-05-08 |
1949-02-06 |
+6.1259 |
-2.020 |
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) |
| 2026-07-29 00:00 |
07:21:43.71 |
+34:27:14.6 |
HIP 35647 |
26.04 |
| 2026-07-29 12:00 |
07:21:44.99 |
+34:27:13.4 |
HIP 35647 |
26.06 |
| 2026-07-30 00:00 |
07:21:46.26 |
+34:27:12.3 |
HIP 35647 |
26.09 |
| 2026-07-30 12:00 |
07:21:47.52 |
+34:27:11.1 |
HIP 35647 |
26.13 |
| 2026-07-31 00:00 |
07:21:48.79 |
+34:27:10.0 |
HIP 35647 |
26.16 |
| 2026-07-31 12:00 |
07:21:50.05 |
+34:27:09.0 |
HIP 35647 |
26.20 |
| 2026-08-01 00:00 |
07:21:51.30 |
+34:27:07.9 |
HIP 35647 |
26.24 |
| 2026-08-01 12:00 |
07:21:52.56 |
+34:27:06.9 |
HIP 35647 |
26.29 |
| 2026-08-02 00:00 |
07:21:53.81 |
+34:27:05.9 |
HIP 35647 |
26.34 |
| 2026-08-02 12:00 |
07:21:55.05 |
+34:27:05.0 |
HIP 35647 |
26.39 |
| 2026-08-03 00:00 |
07:21:56.29 |
+34:27:04.1 |
HIP 35647 |
26.44 |
| 2026-08-03 12:00 |
07:21:57.53 |
+34:27:03.3 |
HIP 35647 |
26.50 |
| 2026-08-04 00:00 |
07:21:58.76 |
+34:27:02.4 |
HIP 35647 |
26.56 |
| 2026-08-04 12:00 |
07:21:59.99 |
+34:27:01.6 |
HIP 35647 |
26.62 |
| 2026-08-05 00:00 |
07:22:01.21 |
+34:27:00.9 |
HIP 35647 |
26.68 |
| 2026-08-05 12:00 |
07:22:02.43 |
+34:27:00.1 |
HIP 35647 |
26.75 |
| 2026-08-06 00:00 |
07:22:03.65 |
+34:26:59.5 |
HIP 35647 |
26.82 |
| 2026-08-06 12:00 |
07:22:04.86 |
+34:26:58.8 |
HIP 35647 |
26.89 |
| 2026-08-07 00:00 |
07:22:06.06 |
+34:26:58.2 |
HIP 35647 |
26.96 |
| 2026-08-07 12:00 |
07:22:07.27 |
+34:26:57.6 |
HIP 35647 |
27.04 |
| 2026-08-08 00:00 |
07:22:08.46 |
+34:26:57.0 |
HIP 35647 |
27.12 |
| 2026-08-08 12:00 |
07:22:09.65 |
+34:26:56.5 |
HIP 35647 |
27.20 |
| 2026-08-09 00:00 |
07:22:10.84 |
+34:26:56.1 |
HIP 35647 |
27.28 |
| 2026-08-09 12:00 |
07:22:12.02 |
+34:26:55.6 |
HIP 35647 |
27.36 |
| 2026-08-10 00:00 |
07:22:13.20 |
+34:26:55.2 |
HIP 35647 |
27.45 |
| 2026-08-10 12:00 |
07:22:14.37 |
+34:26:54.8 |
HIP 35647 |
27.54 |
| 2026-08-11 00:00 |
07:22:15.53 |
+34:26:54.5 |
HIP 35647 |
27.63 |
| 2026-08-11 12:00 |
07:22:16.69 |
+34:26:54.2 |
HIP 35647 |
27.72 |
| 2026-08-12 00:00 |
07:22:17.85 |
+34:26:53.9 |
HIP 35647 |
27.82 |
| 2026-08-12 12:00 |
07:22:18.99 |
+34:26:53.7 |
HIP 35647 |
27.91 |
| 2026-08-13 00:00 |
07:22:20.14 |
+34:26:53.5 |
HIP 35687 |
28.00 |
| 2026-08-13 12:00 |
07:22:21.27 |
+34:26:53.3 |
HIP 35687 |
28.05 |
| 2026-08-14 00:00 |
07:22:22.40 |
+34:26:53.2 |
HIP 35687 |
28.11 |
| 2026-08-14 12:00 |
07:22:23.53 |
+34:26:53.1 |
HIP 35932 |
28.16 |
| 2026-08-15 00:00 |
07:22:24.65 |
+34:26:53.1 |
HIP 35932 |
27.95 |
| 2026-08-15 12:00 |
07:22:25.76 |
+34:26:53.1 |
HIP 35932 |
27.75 |
| 2026-08-16 00:00 |
07:22:26.87 |
+34:26:53.1 |
HIP 35932 |
27.55 |
| 2026-08-16 12:00 |
07:22:27.97 |
+34:26:53.2 |
HIP 35932 |
27.35 |
| 2026-08-17 00:00 |
07:22:29.06 |
+34:26:53.3 |
HIP 35932 |
27.15 |
| 2026-08-17 12:00 |
07:22:30.15 |
+34:26:53.4 |
HIP 35932 |
26.95 |
| 2026-08-18 00:00 |
07:22:31.23 |
+34:26:53.6 |
HIP 35932 |
26.75 |
| 2026-08-18 12:00 |
07:22:32.30 |
+34:26:53.8 |
HIP 35932 |
26.56 |
| 2026-08-19 00:00 |
07:22:33.37 |
+34:26:54.0 |
HIP 35932 |
26.37 |