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) |
| 2026-09-20 00:00 |
01:30:08.29 |
+30:54:26.7 |
HIP 6978 |
7.02 |
| 2026-09-20 12:00 |
01:30:06.09 |
+30:54:21.5 |
HIP 6978 |
6.87 |
| 2026-09-21 00:00 |
01:30:03.88 |
+30:54:16.0 |
HIP 6978 |
6.74 |
| 2026-09-21 12:00 |
01:30:01.66 |
+30:54:10.5 |
HIP 6978 |
6.65 |
| 2026-09-22 00:00 |
01:29:59.43 |
+30:54:04.8 |
HIP 6978 |
6.60 |
| 2026-09-22 12:00 |
01:29:57.19 |
+30:53:58.9 |
HIP 6948 |
6.35 |
| 2026-09-23 00:00 |
01:29:54.95 |
+30:53:52.9 |
HIP 6948 |
5.86 |
| 2026-09-23 12:00 |
01:29:52.69 |
+30:53:46.8 |
HIP 6948 |
5.38 |
| 2026-09-24 00:00 |
01:29:50.43 |
+30:53:40.5 |
HIP 6948 |
4.89 |
| 2026-09-24 12:00 |
01:29:48.15 |
+30:53:34.1 |
HIP 6948 |
4.40 |
| 2026-09-25 00:00 |
01:29:45.87 |
+30:53:27.6 |
HIP 6948 |
3.92 |
| 2026-09-25 12:00 |
01:29:43.58 |
+30:53:20.9 |
HIP 6948 |
3.44 |
| 2026-09-26 00:00 |
01:29:41.29 |
+30:53:14.1 |
HIP 6948 |
2.96 |
| 2026-09-26 12:00 |
01:29:38.98 |
+30:53:07.2 |
HIP 6948 |
2.50 |
| 2026-09-27 00:00 |
01:29:36.67 |
+30:53:00.1 |
HIP 6948 |
2.06 |
| 2026-09-27 12:00 |
01:29:34.35 |
+30:52:52.8 |
HIP 6948 |
1.65 |
| 2026-09-28 00:00 |
01:29:32.02 |
+30:52:45.5 |
HIP 6948 |
1.32 |
| 2026-09-28 12:00 |
01:29:29.69 |
+30:52:38.0 |
HIP 6948 |
1.14 |
| 2026-09-29 00:00 |
01:29:27.35 |
+30:52:30.4 |
HIP 6948 |
1.18 |
| 2026-09-29 12:00 |
01:29:25.00 |
+30:52:22.6 |
HIP 6948 |
1.43 |
| 2026-09-30 00:00 |
01:29:22.65 |
+30:52:14.7 |
HIP 6948 |
1.80 |
| 2026-09-30 12:00 |
01:29:20.28 |
+30:52:06.7 |
HIP 6948 |
2.23 |
| 2026-10-01 00:00 |
01:29:17.92 |
+30:51:58.5 |
HIP 6948 |
2.70 |
| 2026-10-01 12:00 |
01:29:15.54 |
+30:51:50.2 |
HIP 6948 |
3.19 |
| 2026-10-02 00:00 |
01:29:13.17 |
+30:51:41.8 |
HIP 6948 |
3.69 |
| 2026-10-02 12:00 |
01:29:10.78 |
+30:51:33.2 |
HIP 6948 |
4.20 |
| 2026-10-03 00:00 |
01:29:08.39 |
+30:51:24.5 |
HIP 6948 |
4.72 |
| 2026-10-03 12:00 |
01:29:06.00 |
+30:51:15.7 |
HIP 6948 |
5.24 |
| 2026-10-04 00:00 |
01:29:03.59 |
+30:51:06.7 |
HIP 6948 |
5.77 |
| 2026-10-04 12:00 |
01:29:01.19 |
+30:50:57.6 |
HIP 6948 |
6.30 |
| 2026-10-05 00:00 |
01:28:58.78 |
+30:50:48.4 |
HIP 6948 |
6.83 |
| 2026-10-05 12:00 |
01:28:56.36 |
+30:50:39.0 |
HIP 6948 |
7.37 |
| 2026-10-06 00:00 |
01:28:53.94 |
+30:50:29.6 |
HIP 6948 |
7.90 |
| 2026-10-06 12:00 |
01:28:51.52 |
+30:50:20.0 |
HIP 6948 |
8.45 |
| 2026-10-07 00:00 |
01:28:49.09 |
+30:50:10.2 |
HIP 6948 |
8.99 |
| 2026-10-07 12:00 |
01:28:46.66 |
+30:50:00.4 |
HIP 6948 |
9.53 |
| 2026-10-08 00:00 |
01:28:44.22 |
+30:49:50.4 |
HIP 6948 |
10.08 |
| 2026-10-08 12:00 |
01:28:41.78 |
+30:49:40.3 |
HIP 6948 |
10.63 |
| 2026-10-09 00:00 |
01:28:39.34 |
+30:49:30.0 |
HIP 6948 |
11.18 |
| 2026-10-09 12:00 |
01:28:36.89 |
+30:49:19.7 |
HIP 6948 |
11.73 |
| 2026-10-10 00:00 |
01:28:34.44 |
+30:49:09.2 |
HIP 6948 |
12.28 |
| 2026-10-10 12:00 |
01:28:31.99 |
+30:48:58.6 |
HIP 6948 |
12.84 |
| 2026-10-11 00:00 |
01:28:29.54 |
+30:48:47.8 |
HIP 6948 |
13.39 |