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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
13:42:52.05 |
+63:48:12.5 |
HIP 67045 |
11.45 |
| 2026-09-25 12:00 |
13:42:56.55 |
+63:47:56.8 |
HIP 67045 |
10.89 |
| 2026-09-26 00:00 |
13:43:01.07 |
+63:47:41.3 |
HIP 67045 |
10.32 |
| 2026-09-26 12:00 |
13:43:05.61 |
+63:47:26.0 |
HIP 67045 |
9.76 |
| 2026-09-27 00:00 |
13:43:10.16 |
+63:47:11.0 |
HIP 67045 |
9.20 |
| 2026-09-27 12:00 |
13:43:14.72 |
+63:46:56.2 |
HIP 67045 |
8.64 |
| 2026-09-28 00:00 |
13:43:19.31 |
+63:46:41.7 |
HIP 67045 |
8.08 |
| 2026-09-28 12:00 |
13:43:23.90 |
+63:46:27.3 |
HIP 67045 |
7.52 |
| 2026-09-29 00:00 |
13:43:28.52 |
+63:46:13.3 |
HIP 67045 |
6.96 |
| 2026-09-29 12:00 |
13:43:33.15 |
+63:45:59.5 |
HIP 67045 |
6.40 |
| 2026-09-30 00:00 |
13:43:37.79 |
+63:45:45.9 |
HIP 67045 |
5.84 |
| 2026-09-30 12:00 |
13:43:42.45 |
+63:45:32.6 |
HIP 67045 |
5.28 |
| 2026-10-01 00:00 |
13:43:47.12 |
+63:45:19.5 |
HIP 67045 |
4.72 |
| 2026-10-01 12:00 |
13:43:51.80 |
+63:45:06.7 |
HIP 67045 |
4.16 |
| 2026-10-02 00:00 |
13:43:56.50 |
+63:44:54.1 |
HIP 67045 |
3.61 |
| 2026-10-02 12:00 |
13:44:01.22 |
+63:44:41.7 |
HIP 67045 |
3.05 |
| 2026-10-03 00:00 |
13:44:05.94 |
+63:44:29.7 |
HIP 67045 |
2.50 |
| 2026-10-03 12:00 |
13:44:10.68 |
+63:44:17.8 |
HIP 67045 |
1.96 |
| 2026-10-04 00:00 |
13:44:15.43 |
+63:44:06.3 |
HIP 67045 |
1.44 |
| 2026-10-04 12:00 |
13:44:20.19 |
+63:43:55.0 |
HIP 67045 |
0.96 |
| 2026-10-05 00:00 |
13:44:24.97 |
+63:43:43.9 |
HIP 67045 |
0.63 |
| 2026-10-05 12:00 |
13:44:29.75 |
+63:43:33.1 |
HIP 67045 |
0.71 |
| 2026-10-06 00:00 |
13:44:34.55 |
+63:43:22.6 |
HIP 67045 |
1.12 |
| 2026-10-06 12:00 |
13:44:39.36 |
+63:43:12.3 |
HIP 67045 |
1.62 |
| 2026-10-07 00:00 |
13:44:44.18 |
+63:43:02.3 |
HIP 67045 |
2.15 |
| 2026-10-07 12:00 |
13:44:49.00 |
+63:42:52.5 |
HIP 67045 |
2.69 |
| 2026-10-08 00:00 |
13:44:53.84 |
+63:42:43.1 |
HIP 67045 |
3.24 |
| 2026-10-08 12:00 |
13:44:58.69 |
+63:42:33.8 |
HIP 67045 |
3.80 |
| 2026-10-09 00:00 |
13:45:03.55 |
+63:42:24.9 |
HIP 67045 |
4.35 |
| 2026-10-09 12:00 |
13:45:08.42 |
+63:42:16.2 |
HIP 67045 |
4.91 |
| 2026-10-10 00:00 |
13:45:13.29 |
+63:42:07.8 |
HIP 67045 |
5.46 |
| 2026-10-10 12:00 |
13:45:18.18 |
+63:41:59.6 |
HIP 67045 |
6.02 |
| 2026-10-11 00:00 |
13:45:23.07 |
+63:41:51.7 |
HIP 67045 |
6.58 |
| 2026-10-11 12:00 |
13:45:27.97 |
+63:41:44.1 |
HIP 67045 |
7.13 |
| 2026-10-12 00:00 |
13:45:32.87 |
+63:41:36.8 |
HIP 67045 |
7.69 |
| 2026-10-12 12:00 |
13:45:37.79 |
+63:41:29.7 |
HIP 67045 |
8.25 |
| 2026-10-13 00:00 |
13:45:42.71 |
+63:41:22.9 |
HIP 67045 |
8.80 |
| 2026-10-13 12:00 |
13:45:47.63 |
+63:41:16.4 |
HIP 67045 |
9.36 |
| 2026-10-14 00:00 |
13:45:52.57 |
+63:41:10.2 |
HIP 67045 |
9.92 |
| 2026-10-14 12:00 |
13:45:57.51 |
+63:41:04.2 |
HIP 67045 |
10.47 |
| 2026-10-15 00:00 |
13:46:02.45 |
+63:40:58.5 |
HIP 67238 |
10.19 |
| 2026-10-15 12:00 |
13:46:07.40 |
+63:40:53.1 |
HIP 67238 |
9.88 |
| 2026-10-16 00:00 |
13:46:12.35 |
+63:40:47.9 |
HIP 67238 |
9.59 |