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) |
| 2026-05-12 00:00 |
03:16:20.49 |
+24:34:39.6 |
HIP 15181 |
9.45 |
| 2026-05-12 12:00 |
03:17:22.01 |
+24:38:44.9 |
HIP 15361 |
16.87 |
| 2026-05-13 00:00 |
03:18:23.46 |
+24:42:48.6 |
HIP 15361 |
10.76 |
| 2026-05-13 12:00 |
03:19:24.84 |
+24:46:50.7 |
HIP 15361 |
19.19 |
| 2026-05-14 00:00 |
03:20:26.14 |
+24:50:51.2 |
HIP 15560 |
18.26 |
| 2026-05-14 12:00 |
03:21:27.38 |
+24:54:50.0 |
HIP 15560 |
26.15 |
| 2026-05-15 00:00 |
03:22:28.54 |
+24:58:47.1 |
HIP 15861 |
29.27 |
| 2026-05-15 12:00 |
03:23:29.63 |
+25:02:42.7 |
HIP 15861 |
22.22 |
| 2026-05-16 00:00 |
03:24:30.65 |
+25:06:36.6 |
HIP 15861 |
23.32 |
| 2026-05-16 12:00 |
03:25:31.59 |
+25:10:28.9 |
HIP 16071 |
28.97 |
| 2026-05-17 00:00 |
03:26:32.46 |
+25:14:19.6 |
HIP 16071 |
25.64 |
| 2026-05-17 12:00 |
03:27:33.25 |
+25:18:08.7 |
HIP 16071 |
29.73 |
| 2026-05-18 00:00 |
03:28:33.97 |
+25:21:56.2 |
HIP 16407 |
37.19 |
| 2026-05-18 12:00 |
03:29:34.62 |
+25:25:42.0 |
HIP 16407 |
25.13 |
| 2026-05-19 00:00 |
03:30:35.19 |
+25:29:26.3 |
HIP 16407 |
16.84 |
| 2026-05-19 12:00 |
03:31:35.68 |
+25:33:09.0 |
HIP 16429 |
10.19 |
| 2026-05-20 00:00 |
03:32:36.10 |
+25:36:50.0 |
HIP 16429 |
15.89 |
| 2026-05-20 12:00 |
03:33:36.44 |
+25:40:29.5 |
HIP 16429 |
28.24 |
| 2026-05-21 00:00 |
03:34:36.70 |
+25:44:07.4 |
HIP 16805 |
30.77 |
| 2026-05-21 12:00 |
03:35:36.88 |
+25:47:43.8 |
HIP 16879 |
24.20 |
| 2026-05-22 00:00 |
03:36:36.99 |
+25:51:18.5 |
HIP 16879 |
11.19 |
| 2026-05-22 12:00 |
03:37:37.02 |
+25:54:51.7 |
HIP 16879 |
7.49 |
| 2026-05-23 00:00 |
03:38:36.97 |
+25:58:23.3 |
HIP 16879 |
19.38 |
| 2026-05-23 12:00 |
03:39:36.84 |
+26:01:53.4 |
HIP 16879 |
32.88 |
| 2026-05-24 00:00 |
03:40:36.63 |
+26:05:21.9 |
HIP 17245 |
31.22 |
| 2026-05-24 12:00 |
03:41:36.34 |
+26:08:48.9 |
HIP 17324 |
28.19 |
| 2026-05-25 00:00 |
03:42:35.97 |
+26:12:14.3 |
HIP 17407 |
18.96 |
| 2026-05-25 12:00 |
03:43:35.53 |
+26:15:38.2 |
HIP 17407 |
7.61 |
| 2026-05-26 00:00 |
03:44:35.00 |
+26:19:00.5 |
HIP 17525 |
7.58 |
| 2026-05-26 12:00 |
03:45:34.39 |
+26:22:21.3 |
HIP 17525 |
7.58 |
| 2026-05-27 00:00 |
03:46:33.70 |
+26:25:40.6 |
HIP 17609 |
13.09 |
| 2026-05-27 12:00 |
03:47:32.93 |
+26:28:58.4 |
HIP 17774 |
12.11 |
| 2026-05-28 00:00 |
03:48:32.09 |
+26:32:14.6 |
HIP 17774 |
4.27 |
| 2026-05-28 12:00 |
03:49:31.16 |
+26:35:29.4 |
HIP 17774 |
16.14 |
| 2026-05-29 00:00 |
03:50:30.15 |
+26:38:42.6 |
HIP 17774 |
29.51 |
| 2026-05-29 12:00 |
03:51:29.05 |
+26:41:54.4 |
HIP 18163 |
20.19 |
| 2026-05-30 00:00 |
03:52:27.88 |
+26:45:04.7 |
HIP 18163 |
8.25 |
| 2026-05-30 12:00 |
03:53:26.63 |
+26:48:13.5 |
HIP 18230 |
7.65 |
| 2026-05-31 00:00 |
03:54:25.29 |
+26:51:20.8 |
HIP 18230 |
8.16 |
| 2026-05-31 12:00 |
03:55:23.87 |
+26:54:26.6 |
HIP 18330 |
10.16 |
| 2026-06-01 00:00 |
03:56:22.37 |
+26:57:31.0 |
HIP 18439 |
13.09 |
| 2026-06-01 12:00 |
03:57:20.79 |
+27:00:33.9 |
HIP 18439 |
19.44 |
| 2026-06-02 00:00 |
03:58:19.12 |
+27:03:35.4 |
HIP 18621 |
13.21 |