177P/Barnard
メタデータ
| 項目 |
値 |
| Designation |
177P/Barnard |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2006-08-28T16:23:52.091520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:46Z |
| Obs used |
1702 |
| NEO |
Yes |
| M1 |
15.700 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-04-24.0000000 |
| e |
0.95444204 |
| q (au) |
1.107271 |
| a (au) |
24.304669 |
| i (deg) |
31.216459 |
| Ω (om, deg) |
272.067721 |
| ω (w, deg) |
60.453551 |
| M (ma, deg) |
358.957950 |
等級
散乱 + 全体線形
$$
M_a = (15.195 + 4.041\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.195 |
| n |
4.041 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 2006-06-23 |
2006-08-28 |
+13.5160 |
-2.197 |
| 2006-08-28 |
2006-11-01 |
-5.2733 |
-2.545 |
| 2006-11-01 |
2006-12-11 |
+35.3909 |
-8.724 |
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) |
| 2026-02-03 00:00 |
08:46:08.04 |
-06:20:17.1 |
HIP 43019 |
12.25 |
| 2026-02-03 12:00 |
08:46:04.47 |
-06:20:03.1 |
HIP 43019 |
12.37 |
| 2026-02-04 00:00 |
08:46:00.91 |
-06:19:48.8 |
HIP 43019 |
12.56 |
| 2026-02-04 12:00 |
08:45:57.34 |
-06:19:34.3 |
HIP 43019 |
12.82 |
| 2026-02-05 00:00 |
08:45:53.79 |
-06:19:19.7 |
HIP 43019 |
13.13 |
| 2026-02-05 12:00 |
08:45:50.24 |
-06:19:04.8 |
HIP 43019 |
13.51 |
| 2026-02-06 00:00 |
08:45:46.69 |
-06:18:49.8 |
HIP 43019 |
13.94 |
| 2026-02-06 12:00 |
08:45:43.14 |
-06:18:34.6 |
HIP 43019 |
14.42 |
| 2026-02-07 00:00 |
08:45:39.60 |
-06:18:19.2 |
HIP 43019 |
14.94 |
| 2026-02-07 12:00 |
08:45:36.07 |
-06:18:03.6 |
HIP 43019 |
15.50 |
| 2026-02-08 00:00 |
08:45:32.54 |
-06:17:47.8 |
HIP 43019 |
16.09 |
| 2026-02-08 12:00 |
08:45:29.02 |
-06:17:31.8 |
HIP 43019 |
16.72 |
| 2026-02-09 00:00 |
08:45:25.50 |
-06:17:15.7 |
HIP 43019 |
17.37 |
| 2026-02-09 12:00 |
08:45:21.99 |
-06:16:59.3 |
HIP 43019 |
18.05 |
| 2026-02-10 00:00 |
08:45:18.49 |
-06:16:42.8 |
HIP 43019 |
18.75 |
| 2026-02-10 12:00 |
08:45:15.00 |
-06:16:26.2 |
HIP 43019 |
19.47 |
| 2026-02-11 00:00 |
08:45:11.51 |
-06:16:09.3 |
HIP 43019 |
20.20 |
| 2026-02-11 12:00 |
08:45:08.03 |
-06:15:52.3 |
HIP 43019 |
20.95 |
| 2026-02-12 00:00 |
08:45:04.55 |
-06:15:35.1 |
HIP 43019 |
21.71 |
| 2026-02-12 12:00 |
08:45:01.09 |
-06:15:17.7 |
HIP 43019 |
22.49 |
| 2026-02-13 00:00 |
08:44:57.63 |
-06:15:00.1 |
HIP 43019 |
23.27 |
| 2026-02-13 12:00 |
08:44:54.19 |
-06:14:42.4 |
HIP 43019 |
24.07 |
| 2026-02-14 00:00 |
08:44:50.75 |
-06:14:24.6 |
HIP 43019 |
24.87 |
| 2026-02-14 12:00 |
08:44:47.32 |
-06:14:06.5 |
HIP 43019 |
25.68 |
| 2026-02-15 00:00 |
08:44:43.90 |
-06:13:48.3 |
HIP 43019 |
26.50 |
| 2026-02-15 12:00 |
08:44:40.49 |
-06:13:29.9 |
HIP 43019 |
27.32 |
| 2026-02-16 00:00 |
08:44:37.09 |
-06:13:11.4 |
HIP 43019 |
28.14 |
| 2026-02-16 12:00 |
08:44:33.71 |
-06:12:52.7 |
HIP 43019 |
28.98 |
| 2026-02-17 00:00 |
08:44:30.33 |
-06:12:33.9 |
HIP 43019 |
29.81 |
| 2026-02-17 12:00 |
08:44:26.96 |
-06:12:14.9 |
HIP 43019 |
30.65 |
| 2026-02-18 00:00 |
08:44:23.61 |
-06:11:55.8 |
HIP 43019 |
31.49 |
| 2026-02-18 12:00 |
08:44:20.27 |
-06:11:36.5 |
HIP 43019 |
32.33 |
| 2026-02-19 00:00 |
08:44:16.94 |
-06:11:17.1 |
HIP 43019 |
33.17 |
| 2026-02-19 12:00 |
08:44:13.62 |
-06:10:57.5 |
HIP 43019 |
34.01 |
| 2026-02-20 00:00 |
08:44:10.32 |
-06:10:37.7 |
HIP 43019 |
34.86 |
| 2026-02-20 12:00 |
08:44:07.03 |
-06:10:17.9 |
HIP 43019 |
35.71 |
| 2026-02-21 00:00 |
08:44:03.75 |
-06:09:57.9 |
HIP 43019 |
36.55 |
| 2026-02-21 12:00 |
08:44:00.49 |
-06:09:37.7 |
HIP 43019 |
37.40 |
| 2026-02-22 00:00 |
08:43:57.24 |
-06:09:17.5 |
HIP 43019 |
38.25 |
| 2026-02-22 12:00 |
08:43:54.01 |
-06:08:57.0 |
HIP 43019 |
39.10 |
| 2026-02-23 00:00 |
08:43:50.78 |
-06:08:36.5 |
HIP 43019 |
39.94 |
| 2026-02-23 12:00 |
08:43:47.58 |
-06:08:15.8 |
HIP 43019 |
40.79 |
| 2026-02-24 00:00 |
08:43:44.39 |
-06:07:55.0 |
HIP 43019 |
41.63 |