C/1992 Q2 (Helin-Lawrence)
メタデータ
| 項目 |
値 |
| Designation |
C/1992 Q2 (Helin-Lawrence) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1993-03-15T02:37:57.362880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:43Z |
| Obs used |
86 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
15.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1993-02-15.0000000 |
| e |
0.96541828 |
| q (au) |
2.038458 |
| a (au) |
58.946112 |
| i (deg) |
106.848257 |
| Ω (om, deg) |
194.667114 |
| ω (w, deg) |
268.852796 |
| M (ma, deg) |
359.938782 |
等級
散乱 + 全体線形
$$
M_a = (8.372 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.372 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.705 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
| 1992-08-29 |
1993-02-22 |
-5.3264 |
+1.913 |
| 1993-03-22 |
1994-04-13 |
-2.1427 |
+3.504 |
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) |
| 2026-02-03 00:00 |
13:56:30.37 |
+64:43:51.5 |
HIP 68266 |
15.95 |
| 2026-02-03 12:00 |
13:56:29.28 |
+64:44:28.0 |
HIP 68266 |
15.67 |
| 2026-02-04 00:00 |
13:56:28.15 |
+64:45:04.5 |
HIP 68266 |
15.42 |
| 2026-02-04 12:00 |
13:56:26.97 |
+64:45:41.0 |
HIP 68266 |
15.20 |
| 2026-02-05 00:00 |
13:56:25.74 |
+64:46:17.4 |
HIP 68266 |
15.00 |
| 2026-02-05 12:00 |
13:56:24.47 |
+64:46:53.8 |
HIP 68266 |
14.83 |
| 2026-02-06 00:00 |
13:56:23.16 |
+64:47:30.1 |
HIP 68266 |
14.69 |
| 2026-02-06 12:00 |
13:56:21.79 |
+64:48:06.3 |
HIP 68266 |
14.58 |
| 2026-02-07 00:00 |
13:56:20.39 |
+64:48:42.5 |
HIP 68266 |
14.50 |
| 2026-02-07 12:00 |
13:56:18.93 |
+64:49:18.6 |
HIP 68266 |
14.46 |
| 2026-02-08 00:00 |
13:56:17.43 |
+64:49:54.7 |
HIP 68266 |
14.44 |
| 2026-02-08 12:00 |
13:56:15.89 |
+64:50:30.7 |
HIP 68266 |
14.45 |
| 2026-02-09 00:00 |
13:56:14.30 |
+64:51:06.6 |
HIP 68266 |
14.50 |
| 2026-02-09 12:00 |
13:56:12.66 |
+64:51:42.4 |
HIP 68266 |
14.58 |
| 2026-02-10 00:00 |
13:56:10.98 |
+64:52:18.2 |
HIP 68266 |
14.69 |
| 2026-02-10 12:00 |
13:56:09.26 |
+64:52:53.9 |
HIP 68266 |
14.82 |
| 2026-02-11 00:00 |
13:56:07.48 |
+64:53:29.5 |
HIP 68266 |
14.99 |
| 2026-02-11 12:00 |
13:56:05.67 |
+64:54:05.0 |
HIP 68266 |
15.19 |
| 2026-02-12 00:00 |
13:56:03.81 |
+64:54:40.4 |
HIP 68266 |
15.41 |
| 2026-02-12 12:00 |
13:56:01.90 |
+64:55:15.8 |
HIP 68266 |
15.66 |
| 2026-02-13 00:00 |
13:55:59.95 |
+64:55:51.0 |
HIP 68266 |
15.93 |
| 2026-02-13 12:00 |
13:55:57.95 |
+64:56:26.2 |
HIP 68266 |
16.23 |
| 2026-02-14 00:00 |
13:55:55.91 |
+64:57:01.2 |
HIP 68266 |
16.55 |
| 2026-02-14 12:00 |
13:55:53.83 |
+64:57:36.1 |
HIP 68266 |
16.89 |
| 2026-02-15 00:00 |
13:55:51.70 |
+64:58:11.0 |
HIP 68266 |
17.25 |
| 2026-02-15 12:00 |
13:55:49.53 |
+64:58:45.7 |
HIP 68266 |
17.63 |
| 2026-02-16 00:00 |
13:55:47.31 |
+64:59:20.3 |
HIP 68266 |
18.03 |
| 2026-02-16 12:00 |
13:55:45.05 |
+64:59:54.8 |
HIP 68266 |
18.44 |
| 2026-02-17 00:00 |
13:55:42.75 |
+65:00:29.2 |
HIP 68266 |
18.87 |
| 2026-02-17 12:00 |
13:55:40.40 |
+65:01:03.4 |
HIP 68266 |
19.31 |
| 2026-02-18 00:00 |
13:55:38.01 |
+65:01:37.6 |
HIP 68266 |
19.76 |
| 2026-02-18 12:00 |
13:55:35.57 |
+65:02:11.6 |
HIP 68085 |
19.60 |
| 2026-02-19 00:00 |
13:55:33.09 |
+65:02:45.4 |
HIP 68085 |
19.13 |
| 2026-02-19 12:00 |
13:55:30.57 |
+65:03:19.2 |
HIP 68085 |
18.67 |
| 2026-02-20 00:00 |
13:55:28.01 |
+65:03:52.8 |
HIP 68085 |
18.22 |
| 2026-02-20 12:00 |
13:55:25.41 |
+65:04:26.3 |
HIP 68085 |
17.79 |
| 2026-02-21 00:00 |
13:55:22.76 |
+65:04:59.6 |
HIP 68085 |
17.37 |
| 2026-02-21 12:00 |
13:55:20.07 |
+65:05:32.8 |
HIP 68085 |
16.97 |
| 2026-02-22 00:00 |
13:55:17.34 |
+65:06:05.8 |
HIP 68085 |
16.59 |
| 2026-02-22 12:00 |
13:55:14.57 |
+65:06:38.7 |
HIP 68085 |
16.23 |
| 2026-02-23 00:00 |
13:55:11.76 |
+65:07:11.5 |
HIP 68085 |
15.88 |
| 2026-02-23 12:00 |
13:55:08.90 |
+65:07:44.1 |
HIP 68085 |
15.56 |
| 2026-02-24 00:00 |
13:55:06.01 |
+65:08:16.5 |
HIP 68085 |
15.26 |