メタデータ
| 項目 |
値 |
| Designation |
C/1991 Y1 (Zanotta-Brewington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-01-31T23:47:40.372800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
266 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
14.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-01-10.0000000 |
| e |
1.00005670 |
| q (au) |
0.643969 |
| a (au) |
-11357.972781 |
| i (deg) |
50.028225 |
| Ω (om, deg) |
254.908258 |
| ω (w, deg) |
197.872524 |
| M (ma, deg) |
-0.000018 |
等級
散乱 + 全体線形
$$
M_a = (9.204 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.204 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
| 1991-12-23 |
1992-01-31 |
+0.0509 |
+0.039 |
| 1992-02-01 |
1992-05-02 |
+12.8239 |
+2.103 |
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) |
| 2026-07-29 00:00 |
17:09:14.30 |
-18:17:33.4 |
HIP 83850 |
17.81 |
| 2026-07-29 12:00 |
17:09:12.92 |
-18:17:33.0 |
HIP 83850 |
17.53 |
| 2026-07-30 00:00 |
17:09:11.55 |
-18:17:32.7 |
HIP 83850 |
17.25 |
| 2026-07-30 12:00 |
17:09:10.19 |
-18:17:32.4 |
HIP 83850 |
16.97 |
| 2026-07-31 00:00 |
17:09:08.85 |
-18:17:32.1 |
HIP 83850 |
16.70 |
| 2026-07-31 12:00 |
17:09:07.52 |
-18:17:31.9 |
HIP 83850 |
16.44 |
| 2026-08-01 00:00 |
17:09:06.21 |
-18:17:31.6 |
HIP 83850 |
16.18 |
| 2026-08-01 12:00 |
17:09:04.91 |
-18:17:31.5 |
HIP 83850 |
15.92 |
| 2026-08-02 00:00 |
17:09:03.62 |
-18:17:31.3 |
HIP 83850 |
15.67 |
| 2026-08-02 12:00 |
17:09:02.35 |
-18:17:31.2 |
HIP 83850 |
15.42 |
| 2026-08-03 00:00 |
17:09:01.09 |
-18:17:31.1 |
HIP 83850 |
15.17 |
| 2026-08-03 12:00 |
17:08:59.85 |
-18:17:31.0 |
HIP 83850 |
14.93 |
| 2026-08-04 00:00 |
17:08:58.62 |
-18:17:31.0 |
HIP 83850 |
14.70 |
| 2026-08-04 12:00 |
17:08:57.40 |
-18:17:30.9 |
HIP 83850 |
14.47 |
| 2026-08-05 00:00 |
17:08:56.20 |
-18:17:31.0 |
HIP 83850 |
14.24 |
| 2026-08-05 12:00 |
17:08:55.02 |
-18:17:31.0 |
HIP 83850 |
14.02 |
| 2026-08-06 00:00 |
17:08:53.85 |
-18:17:31.1 |
HIP 83850 |
13.80 |
| 2026-08-06 12:00 |
17:08:52.69 |
-18:17:31.2 |
HIP 83850 |
13.59 |
| 2026-08-07 00:00 |
17:08:51.55 |
-18:17:31.3 |
HIP 83850 |
13.38 |
| 2026-08-07 12:00 |
17:08:50.43 |
-18:17:31.5 |
HIP 83850 |
13.18 |
| 2026-08-08 00:00 |
17:08:49.32 |
-18:17:31.7 |
HIP 83850 |
12.98 |
| 2026-08-08 12:00 |
17:08:48.22 |
-18:17:31.9 |
HIP 83850 |
12.79 |
| 2026-08-09 00:00 |
17:08:47.14 |
-18:17:32.2 |
HIP 83850 |
12.60 |
| 2026-08-09 12:00 |
17:08:46.08 |
-18:17:32.5 |
HIP 83850 |
12.42 |
| 2026-08-10 00:00 |
17:08:45.03 |
-18:17:32.8 |
HIP 83850 |
12.24 |
| 2026-08-10 12:00 |
17:08:44.00 |
-18:17:33.1 |
HIP 83850 |
12.06 |
| 2026-08-11 00:00 |
17:08:42.98 |
-18:17:33.5 |
HIP 83850 |
11.89 |
| 2026-08-11 12:00 |
17:08:41.98 |
-18:17:33.9 |
HIP 83850 |
11.72 |
| 2026-08-12 00:00 |
17:08:40.99 |
-18:17:34.4 |
HIP 83850 |
11.56 |
| 2026-08-12 12:00 |
17:08:40.02 |
-18:17:34.8 |
HIP 83850 |
11.41 |
| 2026-08-13 00:00 |
17:08:39.07 |
-18:17:35.3 |
HIP 83850 |
11.26 |
| 2026-08-13 12:00 |
17:08:38.13 |
-18:17:35.8 |
HIP 83850 |
11.11 |
| 2026-08-14 00:00 |
17:08:37.21 |
-18:17:36.4 |
HIP 83850 |
10.96 |
| 2026-08-14 12:00 |
17:08:36.31 |
-18:17:37.0 |
HIP 83850 |
10.83 |
| 2026-08-15 00:00 |
17:08:35.42 |
-18:17:37.6 |
HIP 83850 |
10.69 |
| 2026-08-15 12:00 |
17:08:34.55 |
-18:17:38.2 |
HIP 83850 |
10.56 |
| 2026-08-16 00:00 |
17:08:33.69 |
-18:17:38.9 |
HIP 83850 |
10.44 |
| 2026-08-16 12:00 |
17:08:32.85 |
-18:17:39.6 |
HIP 83850 |
10.32 |
| 2026-08-17 00:00 |
17:08:32.03 |
-18:17:40.3 |
HIP 83850 |
10.20 |
| 2026-08-17 12:00 |
17:08:31.23 |
-18:17:41.1 |
HIP 83850 |
10.09 |
| 2026-08-18 00:00 |
17:08:30.44 |
-18:17:41.9 |
HIP 83850 |
9.98 |
| 2026-08-18 12:00 |
17:08:29.67 |
-18:17:42.7 |
HIP 83850 |
9.87 |
| 2026-08-19 00:00 |
17:08:28.91 |
-18:17:43.5 |
HIP 83850 |
9.77 |