メタデータ
| 項目 |
値 |
| Designation |
D/1884 O1 (Barnard) |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1884-08-16T23:21:01.497600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:51Z |
| Obs used |
19 |
| NEO |
Yes |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1884-08-23.0000000 |
| e |
0.58359434 |
| q (au) |
1.279598 |
| a (au) |
3.072961 |
| i (deg) |
5.473223 |
| Ω (om, deg) |
6.750708 |
| ω (w, deg) |
301.053763 |
| M (ma, deg) |
1.102744 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
06:40:46.70 |
+31:46:17.0 |
HIP 31816 |
21.43 |
| 2026-09-20 12:00 |
06:41:09.76 |
+31:46:57.4 |
HIP 32083 |
23.31 |
| 2026-09-21 00:00 |
06:41:32.53 |
+31:47:38.1 |
HIP 32083 |
21.74 |
| 2026-09-21 12:00 |
06:41:55.01 |
+31:48:19.1 |
HIP 32083 |
21.22 |
| 2026-09-22 00:00 |
06:42:17.21 |
+31:49:00.5 |
HIP 32083 |
21.79 |
| 2026-09-22 12:00 |
06:42:39.12 |
+31:49:42.2 |
HIP 32083 |
23.33 |
| 2026-09-23 00:00 |
06:43:00.74 |
+31:50:24.2 |
HIP 32299 |
21.73 |
| 2026-09-23 12:00 |
06:43:22.06 |
+31:51:06.6 |
HIP 32299 |
17.28 |
| 2026-09-24 00:00 |
06:43:43.10 |
+31:51:49.4 |
HIP 32299 |
12.98 |
| 2026-09-24 12:00 |
06:44:03.83 |
+31:52:32.5 |
HIP 32299 |
8.93 |
| 2026-09-25 00:00 |
06:44:24.27 |
+31:53:16.1 |
HIP 32299 |
5.57 |
| 2026-09-25 12:00 |
06:44:44.41 |
+31:54:00.0 |
HIP 32299 |
4.55 |
| 2026-09-26 00:00 |
06:45:04.25 |
+31:54:44.2 |
HIP 32299 |
6.87 |
| 2026-09-26 12:00 |
06:45:23.79 |
+31:55:28.9 |
HIP 32299 |
10.44 |
| 2026-09-27 00:00 |
06:45:43.02 |
+31:56:14.0 |
HIP 32299 |
14.29 |
| 2026-09-27 12:00 |
06:46:01.95 |
+31:56:59.5 |
HIP 32299 |
18.21 |
| 2026-09-28 00:00 |
06:46:20.58 |
+31:57:45.4 |
HIP 32299 |
22.12 |
| 2026-09-28 12:00 |
06:46:38.89 |
+31:58:31.8 |
HIP 32603 |
18.63 |
| 2026-09-29 00:00 |
06:46:56.89 |
+31:59:18.5 |
HIP 32603 |
14.97 |
| 2026-09-29 12:00 |
06:47:14.58 |
+32:00:05.7 |
HIP 32603 |
11.53 |
| 2026-09-30 00:00 |
06:47:31.96 |
+32:00:53.3 |
HIP 32603 |
8.51 |
| 2026-09-30 12:00 |
06:47:49.02 |
+32:01:41.4 |
HIP 32603 |
6.38 |
| 2026-10-01 00:00 |
06:48:05.76 |
+32:02:29.9 |
HIP 32603 |
6.06 |
| 2026-10-01 12:00 |
06:48:22.18 |
+32:03:18.9 |
HIP 32603 |
7.67 |
| 2026-10-02 00:00 |
06:48:38.28 |
+32:04:08.3 |
HIP 32603 |
10.28 |
| 2026-10-02 12:00 |
06:48:54.05 |
+32:04:58.2 |
HIP 32752 |
11.69 |
| 2026-10-03 00:00 |
06:49:09.50 |
+32:05:48.6 |
HIP 32752 |
8.33 |
| 2026-10-03 12:00 |
06:49:24.61 |
+32:06:39.4 |
HIP 32752 |
5.07 |
| 2026-10-04 00:00 |
06:49:39.40 |
+32:07:30.7 |
HIP 32752 |
2.07 |
| 2026-10-04 12:00 |
06:49:53.86 |
+32:08:22.5 |
HIP 32752 |
1.95 |
| 2026-10-05 00:00 |
06:50:07.97 |
+32:09:14.8 |
HIP 32752 |
4.79 |
| 2026-10-05 12:00 |
06:50:21.76 |
+32:10:07.6 |
HIP 32752 |
7.78 |
| 2026-10-06 00:00 |
06:50:35.20 |
+32:11:00.8 |
HIP 32903 |
9.83 |
| 2026-10-06 12:00 |
06:50:48.30 |
+32:11:54.6 |
HIP 32903 |
7.33 |
| 2026-10-07 00:00 |
06:51:01.06 |
+32:12:48.9 |
HIP 32903 |
5.35 |
| 2026-10-07 12:00 |
06:51:13.48 |
+32:13:43.6 |
HIP 32903 |
4.47 |
| 2026-10-08 00:00 |
06:51:25.54 |
+32:14:38.9 |
HIP 32903 |
5.18 |
| 2026-10-08 12:00 |
06:51:37.26 |
+32:15:34.7 |
HIP 32903 |
6.92 |
| 2026-10-09 00:00 |
06:51:48.63 |
+32:16:31.0 |
HIP 32903 |
9.07 |
| 2026-10-09 12:00 |
06:51:59.64 |
+32:17:27.8 |
HIP 32903 |
11.35 |
| 2026-10-10 00:00 |
06:52:10.30 |
+32:18:25.1 |
HIP 32903 |
13.66 |
| 2026-10-10 12:00 |
06:52:20.60 |
+32:19:22.9 |
HIP 32903 |
15.96 |
| 2026-10-11 00:00 |
06:52:30.55 |
+32:20:21.3 |
HIP 32903 |
18.22 |