メタデータ
| 項目 |
値 |
| Designation |
C/1980 E1 (Bowell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1982-03-12T06:53:06.725760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:29Z |
| Obs used |
187 |
| NEO |
- |
| M1 |
5.800 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1982-01-03.0000000 |
| e |
1.05773287 |
| q (au) |
3.363940 |
| a (au) |
-58.267328 |
| i (deg) |
1.661742 |
| Ω (om, deg) |
114.557492 |
| ω (w, deg) |
135.083294 |
| M (ma, deg) |
-0.151323 |
等級
散乱 + 全体線形
$$
M_a = (6.115 + 2.337\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.115 |
| n |
2.337 |
| gf |
0.934 |
| gb |
-0.841 |
| k |
0.998 |
| 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 |
| 1980-02-11 |
1981-05-06 |
+4.8533 |
-3.657 |
| 1981-05-06 |
1982-03-05 |
-7.7973 |
+4.010 |
| 1982-03-15 |
1982-10-11 |
+4.0331 |
-2.092 |
| 1982-10-11 |
1986-12-02 |
-0.1566 |
+0.588 |
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) |
| 2026-09-20 00:00 |
02:30:53.33 |
+13:08:39.7 |
HIP 11691 |
17.18 |
| 2026-09-20 12:00 |
02:30:52.24 |
+13:08:33.9 |
HIP 11691 |
17.26 |
| 2026-09-21 00:00 |
02:30:51.14 |
+13:08:28.1 |
HIP 11691 |
17.34 |
| 2026-09-21 12:00 |
02:30:50.03 |
+13:08:22.3 |
HIP 11691 |
17.43 |
| 2026-09-22 00:00 |
02:30:48.92 |
+13:08:16.5 |
HIP 11691 |
17.52 |
| 2026-09-22 12:00 |
02:30:47.79 |
+13:08:10.6 |
HIP 11691 |
17.61 |
| 2026-09-23 00:00 |
02:30:46.66 |
+13:08:04.6 |
HIP 11691 |
17.72 |
| 2026-09-23 12:00 |
02:30:45.51 |
+13:07:58.6 |
HIP 11691 |
17.82 |
| 2026-09-24 00:00 |
02:30:44.36 |
+13:07:52.6 |
HIP 11691 |
17.93 |
| 2026-09-24 12:00 |
02:30:43.20 |
+13:07:46.6 |
HIP 11691 |
18.05 |
| 2026-09-25 00:00 |
02:30:42.03 |
+13:07:40.5 |
HIP 11691 |
18.17 |
| 2026-09-25 12:00 |
02:30:40.86 |
+13:07:34.4 |
HIP 11691 |
18.29 |
| 2026-09-26 00:00 |
02:30:39.67 |
+13:07:28.2 |
HIP 11691 |
18.42 |
| 2026-09-26 12:00 |
02:30:38.48 |
+13:07:22.0 |
HIP 11691 |
18.56 |
| 2026-09-27 00:00 |
02:30:37.28 |
+13:07:15.8 |
HIP 11691 |
18.70 |
| 2026-09-27 12:00 |
02:30:36.07 |
+13:07:09.6 |
HIP 11691 |
18.85 |
| 2026-09-28 00:00 |
02:30:34.85 |
+13:07:03.3 |
HIP 11691 |
19.00 |
| 2026-09-28 12:00 |
02:30:33.63 |
+13:06:56.9 |
HIP 11691 |
19.15 |
| 2026-09-29 00:00 |
02:30:32.39 |
+13:06:50.6 |
HIP 11691 |
19.31 |
| 2026-09-29 12:00 |
02:30:31.15 |
+13:06:44.2 |
HIP 11691 |
19.48 |
| 2026-09-30 00:00 |
02:30:29.91 |
+13:06:37.8 |
HIP 11691 |
19.65 |
| 2026-09-30 12:00 |
02:30:28.65 |
+13:06:31.3 |
HIP 11691 |
19.82 |
| 2026-10-01 00:00 |
02:30:27.39 |
+13:06:24.8 |
HIP 11691 |
20.00 |
| 2026-10-01 12:00 |
02:30:26.12 |
+13:06:18.3 |
HIP 11691 |
20.18 |
| 2026-10-02 00:00 |
02:30:24.84 |
+13:06:11.8 |
HIP 11691 |
20.37 |
| 2026-10-02 12:00 |
02:30:23.56 |
+13:06:05.2 |
HIP 11691 |
20.56 |
| 2026-10-03 00:00 |
02:30:22.27 |
+13:05:58.6 |
HIP 11691 |
20.76 |
| 2026-10-03 12:00 |
02:30:20.97 |
+13:05:52.0 |
HIP 11691 |
20.96 |
| 2026-10-04 00:00 |
02:30:19.67 |
+13:05:45.3 |
HIP 11691 |
21.17 |
| 2026-10-04 12:00 |
02:30:18.36 |
+13:05:38.6 |
HIP 11691 |
21.38 |
| 2026-10-05 00:00 |
02:30:17.04 |
+13:05:31.9 |
HIP 11691 |
21.59 |
| 2026-10-05 12:00 |
02:30:15.71 |
+13:05:25.1 |
HIP 11691 |
21.81 |
| 2026-10-06 00:00 |
02:30:14.38 |
+13:05:18.4 |
HIP 11691 |
22.03 |
| 2026-10-06 12:00 |
02:30:13.05 |
+13:05:11.6 |
HIP 11691 |
22.26 |
| 2026-10-07 00:00 |
02:30:11.70 |
+13:05:04.7 |
HIP 11691 |
22.49 |
| 2026-10-07 12:00 |
02:30:10.35 |
+13:04:57.9 |
HIP 11691 |
22.72 |
| 2026-10-08 00:00 |
02:30:09.00 |
+13:04:51.0 |
HIP 11691 |
22.96 |
| 2026-10-08 12:00 |
02:30:07.64 |
+13:04:44.1 |
HIP 11691 |
23.20 |
| 2026-10-09 00:00 |
02:30:06.27 |
+13:04:37.2 |
HIP 11691 |
23.45 |
| 2026-10-09 12:00 |
02:30:04.90 |
+13:04:30.3 |
HIP 11691 |
23.70 |
| 2026-10-10 00:00 |
02:30:03.52 |
+13:04:23.3 |
HIP 11691 |
23.95 |
| 2026-10-10 12:00 |
02:30:02.14 |
+13:04:16.3 |
HIP 11691 |
24.21 |
| 2026-10-11 00:00 |
02:30:00.75 |
+13:04:09.3 |
HIP 11691 |
24.47 |