メタデータ
| 項目 |
値 |
| Designation |
C/1995 Q1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1995-08-31T10:02:38.832000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
156 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
16.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1995-10-23.0000000 |
| e |
0.99802567 |
| q (au) |
0.436387 |
| a (au) |
221.030541 |
| i (deg) |
147.394301 |
| Ω (om, deg) |
178.054729 |
| ω (w, deg) |
331.161810 |
| M (ma, deg) |
0.015771 |
等級
散乱 + 全体線形
$$
M_a = (7.436 + 4.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.436 |
| n |
4.304 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
| 1995-08-18 |
1995-08-30 |
-1.3532 |
+0.497 |
| 1995-09-23 |
1995-10-08 |
-3.7552 |
-0.310 |
| 1995-10-08 |
1995-10-17 |
+7.6437 |
-0.177 |
| 1995-10-17 |
1995-11-21 |
+1.5080 |
-0.252 |
| 1995-11-21 |
1995-12-13 |
+13.9429 |
-3.253 |
| 1995-12-13 |
1996-02-19 |
+6.5452 |
-1.275 |
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) |
| 2026-03-26 00:00 |
01:26:41.30 |
+29:56:54.6 |
HIP 6786 |
13.61 |
| 2026-03-26 12:00 |
01:26:43.51 |
+29:57:01.2 |
HIP 6786 |
13.41 |
| 2026-03-27 00:00 |
01:26:45.72 |
+29:57:07.9 |
HIP 6786 |
13.22 |
| 2026-03-27 12:00 |
01:26:47.94 |
+29:57:14.6 |
HIP 6786 |
13.05 |
| 2026-03-28 00:00 |
01:26:50.17 |
+29:57:21.6 |
HIP 6786 |
12.89 |
| 2026-03-28 12:00 |
01:26:52.40 |
+29:57:28.6 |
HIP 6786 |
12.75 |
| 2026-03-29 00:00 |
01:26:54.63 |
+29:57:35.7 |
HIP 6786 |
12.64 |
| 2026-03-29 12:00 |
01:26:56.87 |
+29:57:43.0 |
HIP 6786 |
12.54 |
| 2026-03-30 00:00 |
01:26:59.12 |
+29:57:50.4 |
HIP 6786 |
12.46 |
| 2026-03-30 12:00 |
01:27:01.36 |
+29:57:57.9 |
HIP 6786 |
12.41 |
| 2026-03-31 00:00 |
01:27:03.62 |
+29:58:05.5 |
HIP 6786 |
12.38 |
| 2026-03-31 12:00 |
01:27:05.88 |
+29:58:13.3 |
HIP 6786 |
12.37 |
| 2026-04-01 00:00 |
01:27:08.14 |
+29:58:21.1 |
HIP 6786 |
12.38 |
| 2026-04-01 12:00 |
01:27:10.41 |
+29:58:29.1 |
HIP 6786 |
12.41 |
| 2026-04-02 00:00 |
01:27:12.68 |
+29:58:37.2 |
HIP 6786 |
12.47 |
| 2026-04-02 12:00 |
01:27:14.95 |
+29:58:45.4 |
HIP 6786 |
12.55 |
| 2026-04-03 00:00 |
01:27:17.23 |
+29:58:53.7 |
HIP 6786 |
12.65 |
| 2026-04-03 12:00 |
01:27:19.51 |
+29:59:02.2 |
HIP 6786 |
12.77 |
| 2026-04-04 00:00 |
01:27:21.79 |
+29:59:10.7 |
HIP 6786 |
12.92 |
| 2026-04-04 12:00 |
01:27:24.08 |
+29:59:19.4 |
HIP 6786 |
13.08 |
| 2026-04-05 00:00 |
01:27:26.37 |
+29:59:28.1 |
HIP 6786 |
13.27 |
| 2026-04-05 12:00 |
01:27:28.67 |
+29:59:37.0 |
HIP 6786 |
13.47 |
| 2026-04-06 00:00 |
01:27:30.96 |
+29:59:46.0 |
HIP 6786 |
13.69 |
| 2026-04-06 12:00 |
01:27:33.26 |
+29:59:55.1 |
HIP 6786 |
13.93 |
| 2026-04-07 00:00 |
01:27:35.57 |
+30:00:04.3 |
HIP 6786 |
14.19 |
| 2026-04-07 12:00 |
01:27:37.87 |
+30:00:13.6 |
HIP 6786 |
14.46 |
| 2026-04-08 00:00 |
01:27:40.18 |
+30:00:23.0 |
HIP 6786 |
14.75 |
| 2026-04-08 12:00 |
01:27:42.48 |
+30:00:32.5 |
HIP 6786 |
15.05 |
| 2026-04-09 00:00 |
01:27:44.79 |
+30:00:42.2 |
HIP 6786 |
15.37 |
| 2026-04-09 12:00 |
01:27:47.11 |
+30:00:51.9 |
HIP 6786 |
15.70 |
| 2026-04-10 00:00 |
01:27:49.42 |
+30:01:01.7 |
HIP 6786 |
16.04 |
| 2026-04-10 12:00 |
01:27:51.73 |
+30:01:11.7 |
HIP 6786 |
16.40 |
| 2026-04-11 00:00 |
01:27:54.05 |
+30:01:21.7 |
HIP 6786 |
16.76 |
| 2026-04-11 12:00 |
01:27:56.37 |
+30:01:31.9 |
HIP 6786 |
17.14 |
| 2026-04-12 00:00 |
01:27:58.68 |
+30:01:42.1 |
HIP 6786 |
17.52 |
| 2026-04-12 12:00 |
01:28:01.00 |
+30:01:52.5 |
HIP 6786 |
17.91 |
| 2026-04-13 00:00 |
01:28:03.32 |
+30:02:02.9 |
HIP 6786 |
18.32 |
| 2026-04-13 12:00 |
01:28:05.64 |
+30:02:13.5 |
HIP 6786 |
18.72 |
| 2026-04-14 00:00 |
01:28:07.96 |
+30:02:24.1 |
HIP 6786 |
19.14 |
| 2026-04-14 12:00 |
01:28:10.28 |
+30:02:34.8 |
HIP 6786 |
19.57 |
| 2026-04-15 00:00 |
01:28:12.60 |
+30:02:45.7 |
HIP 6786 |
20.00 |
| 2026-04-15 12:00 |
01:28:14.91 |
+30:02:56.6 |
HIP 6786 |
20.43 |
| 2026-04-16 00:00 |
01:28:17.23 |
+30:03:07.6 |
HIP 6786 |
20.88 |