メタデータ
| 項目 |
値 |
| Designation |
C/1968 N1 (Honda) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1968-08-07T22:10:35.492160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
137 |
| NEO |
- |
| M1 |
5.200 |
| K1 |
12.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1968-09-04.0000000 |
| e |
1.00071634 |
| q (au) |
1.160438 |
| a (au) |
-1619.950396 |
| i (deg) |
143.238254 |
| Ω (om, deg) |
106.747265 |
| ω (w, deg) |
88.715828 |
| M (ma, deg) |
0.000409 |
等級
散乱 + 全体線形
$$
M_a = (5.762 + 5.761\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.762 |
| n |
5.761 |
| gf |
1.000 |
| gb |
-0.601 |
| 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) |
| 2026-07-29 00:00 |
13:03:07.53 |
-45:26:58.5 |
HIP 63868 |
24.22 |
| 2026-07-29 12:00 |
13:03:08.10 |
-45:26:48.0 |
HIP 63868 |
24.10 |
| 2026-07-30 00:00 |
13:03:08.69 |
-45:26:37.6 |
HIP 63868 |
23.97 |
| 2026-07-30 12:00 |
13:03:09.29 |
-45:26:27.3 |
HIP 63868 |
23.84 |
| 2026-07-31 00:00 |
13:03:09.90 |
-45:26:17.0 |
HIP 63868 |
23.71 |
| 2026-07-31 12:00 |
13:03:10.53 |
-45:26:06.9 |
HIP 63868 |
23.58 |
| 2026-08-01 00:00 |
13:03:11.18 |
-45:25:56.8 |
HIP 63868 |
23.44 |
| 2026-08-01 12:00 |
13:03:11.83 |
-45:25:46.9 |
HIP 63868 |
23.31 |
| 2026-08-02 00:00 |
13:03:12.51 |
-45:25:37.0 |
HIP 63868 |
23.17 |
| 2026-08-02 12:00 |
13:03:13.19 |
-45:25:27.2 |
HIP 63868 |
23.04 |
| 2026-08-03 00:00 |
13:03:13.89 |
-45:25:17.5 |
HIP 63868 |
22.90 |
| 2026-08-03 12:00 |
13:03:14.61 |
-45:25:07.9 |
HIP 63868 |
22.76 |
| 2026-08-04 00:00 |
13:03:15.34 |
-45:24:58.4 |
HIP 63868 |
22.62 |
| 2026-08-04 12:00 |
13:03:16.08 |
-45:24:49.0 |
HIP 63868 |
22.48 |
| 2026-08-05 00:00 |
13:03:16.84 |
-45:24:39.7 |
HIP 63868 |
22.33 |
| 2026-08-05 12:00 |
13:03:17.61 |
-45:24:30.5 |
HIP 63868 |
22.19 |
| 2026-08-06 00:00 |
13:03:18.39 |
-45:24:21.4 |
HIP 63868 |
22.04 |
| 2026-08-06 12:00 |
13:03:19.19 |
-45:24:12.4 |
HIP 63868 |
21.89 |
| 2026-08-07 00:00 |
13:03:20.00 |
-45:24:03.4 |
HIP 63868 |
21.74 |
| 2026-08-07 12:00 |
13:03:20.83 |
-45:23:54.6 |
HIP 63868 |
21.59 |
| 2026-08-08 00:00 |
13:03:21.67 |
-45:23:45.9 |
HIP 63868 |
21.44 |
| 2026-08-08 12:00 |
13:03:22.52 |
-45:23:37.3 |
HIP 63868 |
21.28 |
| 2026-08-09 00:00 |
13:03:23.39 |
-45:23:28.8 |
HIP 63868 |
21.13 |
| 2026-08-09 12:00 |
13:03:24.27 |
-45:23:20.4 |
HIP 63868 |
20.97 |
| 2026-08-10 00:00 |
13:03:25.17 |
-45:23:12.0 |
HIP 63868 |
20.81 |
| 2026-08-10 12:00 |
13:03:26.07 |
-45:23:03.8 |
HIP 63868 |
20.65 |
| 2026-08-11 00:00 |
13:03:26.99 |
-45:22:55.7 |
HIP 63868 |
20.49 |
| 2026-08-11 12:00 |
13:03:27.93 |
-45:22:47.7 |
HIP 63868 |
20.33 |
| 2026-08-12 00:00 |
13:03:28.88 |
-45:22:39.8 |
HIP 63868 |
20.17 |
| 2026-08-12 12:00 |
13:03:29.84 |
-45:22:32.0 |
HIP 63868 |
20.00 |
| 2026-08-13 00:00 |
13:03:30.81 |
-45:22:24.3 |
HIP 63868 |
19.83 |
| 2026-08-13 12:00 |
13:03:31.80 |
-45:22:16.8 |
HIP 63868 |
19.67 |
| 2026-08-14 00:00 |
13:03:32.80 |
-45:22:09.3 |
HIP 63868 |
19.50 |
| 2026-08-14 12:00 |
13:03:33.81 |
-45:22:01.9 |
HIP 63868 |
19.32 |
| 2026-08-15 00:00 |
13:03:34.84 |
-45:21:54.7 |
HIP 63868 |
19.15 |
| 2026-08-15 12:00 |
13:03:35.87 |
-45:21:47.5 |
HIP 63868 |
18.98 |
| 2026-08-16 00:00 |
13:03:36.92 |
-45:21:40.5 |
HIP 63868 |
18.80 |
| 2026-08-16 12:00 |
13:03:37.99 |
-45:21:33.6 |
HIP 63868 |
18.62 |
| 2026-08-17 00:00 |
13:03:39.06 |
-45:21:26.8 |
HIP 63868 |
18.45 |
| 2026-08-17 12:00 |
13:03:40.15 |
-45:21:20.1 |
HIP 63868 |
18.27 |
| 2026-08-18 00:00 |
13:03:41.25 |
-45:21:13.5 |
HIP 63868 |
18.08 |
| 2026-08-18 12:00 |
13:03:42.36 |
-45:21:07.0 |
HIP 63868 |
17.90 |
| 2026-08-19 00:00 |
13:03:43.49 |
-45:21:00.6 |
HIP 63868 |
17.72 |