メタデータ
| 項目 |
値 |
| Designation |
C/1968 Q2 (Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-11-03T20:03:50.408640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
33.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1968-10-22.0000000 |
| e |
1.00000000 |
| q (au) |
1.099008 |
| a (au) |
- |
| i (deg) |
127.912524 |
| Ω (om, deg) |
253.292861 |
| ω (w, deg) |
282.803926 |
| M (ma, deg) |
- |
等級
散乱 + 全体線形
$$
M_a = (7.086 + 3.394\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.086 |
| n |
3.394 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
13:00:03.63 |
+52:51:01.9 |
HIP 63522 |
20.65 |
| 2026-03-26 12:00 |
13:00:01.42 |
+52:51:10.2 |
HIP 63522 |
20.92 |
| 2026-03-27 00:00 |
12:59:59.21 |
+52:51:18.3 |
HIP 63522 |
21.18 |
| 2026-03-27 12:00 |
12:59:57.00 |
+52:51:26.3 |
HIP 63522 |
21.45 |
| 2026-03-28 00:00 |
12:59:54.78 |
+52:51:34.1 |
HIP 63522 |
21.71 |
| 2026-03-28 12:00 |
12:59:52.56 |
+52:51:41.8 |
HIP 63522 |
21.98 |
| 2026-03-29 00:00 |
12:59:50.33 |
+52:51:49.3 |
HIP 63522 |
22.25 |
| 2026-03-29 12:00 |
12:59:48.10 |
+52:51:56.6 |
HIP 63522 |
22.52 |
| 2026-03-30 00:00 |
12:59:45.87 |
+52:52:03.8 |
HIP 63522 |
22.79 |
| 2026-03-30 12:00 |
12:59:43.64 |
+52:52:10.9 |
HIP 63522 |
23.06 |
| 2026-03-31 00:00 |
12:59:41.41 |
+52:52:17.7 |
HIP 63522 |
23.33 |
| 2026-03-31 12:00 |
12:59:39.17 |
+52:52:24.4 |
HIP 63285 |
23.51 |
| 2026-04-01 00:00 |
12:59:36.93 |
+52:52:31.0 |
HIP 63285 |
23.41 |
| 2026-04-01 12:00 |
12:59:34.69 |
+52:52:37.4 |
HIP 63285 |
23.31 |
| 2026-04-02 00:00 |
12:59:32.45 |
+52:52:43.6 |
HIP 63285 |
23.21 |
| 2026-04-02 12:00 |
12:59:30.21 |
+52:52:49.7 |
HIP 63285 |
23.11 |
| 2026-04-03 00:00 |
12:59:27.96 |
+52:52:55.6 |
HIP 63285 |
23.02 |
| 2026-04-03 12:00 |
12:59:25.72 |
+52:53:01.4 |
HIP 63285 |
22.93 |
| 2026-04-04 00:00 |
12:59:23.47 |
+52:53:07.0 |
HIP 63285 |
22.84 |
| 2026-04-04 12:00 |
12:59:21.22 |
+52:53:12.4 |
HIP 63285 |
22.76 |
| 2026-04-05 00:00 |
12:59:18.98 |
+52:53:17.7 |
HIP 63285 |
22.68 |
| 2026-04-05 12:00 |
12:59:16.73 |
+52:53:22.8 |
HIP 63285 |
22.60 |
| 2026-04-06 00:00 |
12:59:14.48 |
+52:53:27.8 |
HIP 63285 |
22.52 |
| 2026-04-06 12:00 |
12:59:12.23 |
+52:53:32.6 |
HIP 63285 |
22.45 |
| 2026-04-07 00:00 |
12:59:09.98 |
+52:53:37.2 |
HIP 63285 |
22.37 |
| 2026-04-07 12:00 |
12:59:07.73 |
+52:53:41.6 |
HIP 63285 |
22.31 |
| 2026-04-08 00:00 |
12:59:05.49 |
+52:53:45.9 |
HIP 63285 |
22.24 |
| 2026-04-08 12:00 |
12:59:03.24 |
+52:53:50.1 |
HIP 63285 |
22.18 |
| 2026-04-09 00:00 |
12:59:00.99 |
+52:53:54.0 |
HIP 63285 |
22.12 |
| 2026-04-09 12:00 |
12:58:58.75 |
+52:53:57.9 |
HIP 63285 |
22.06 |
| 2026-04-10 00:00 |
12:58:56.51 |
+52:54:01.5 |
HIP 63285 |
22.00 |
| 2026-04-10 12:00 |
12:58:54.26 |
+52:54:05.0 |
HIP 63285 |
21.95 |
| 2026-04-11 00:00 |
12:58:52.02 |
+52:54:08.3 |
HIP 63285 |
21.90 |
| 2026-04-11 12:00 |
12:58:49.78 |
+52:54:11.4 |
HIP 63285 |
21.86 |
| 2026-04-12 00:00 |
12:58:47.54 |
+52:54:14.4 |
HIP 63285 |
21.81 |
| 2026-04-12 12:00 |
12:58:45.31 |
+52:54:17.2 |
HIP 63285 |
21.77 |
| 2026-04-13 00:00 |
12:58:43.08 |
+52:54:19.9 |
HIP 63285 |
21.73 |
| 2026-04-13 12:00 |
12:58:40.84 |
+52:54:22.4 |
HIP 63285 |
21.70 |
| 2026-04-14 00:00 |
12:58:38.62 |
+52:54:24.7 |
HIP 63285 |
21.66 |
| 2026-04-14 12:00 |
12:58:36.39 |
+52:54:26.8 |
HIP 63285 |
21.63 |
| 2026-04-15 00:00 |
12:58:34.17 |
+52:54:28.8 |
HIP 63285 |
21.61 |
| 2026-04-15 12:00 |
12:58:31.95 |
+52:54:30.6 |
HIP 63285 |
21.58 |
| 2026-04-16 00:00 |
12:58:29.73 |
+52:54:32.3 |
HIP 63285 |
21.56 |