メタデータ
| 項目 |
値 |
| Designation |
C/1976 J1 (Harlan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-11-03T03:38:09.047040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
41 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1976-06-27.0000000 |
| e |
0.99974240 |
| q (au) |
1.568851 |
| a (au) |
6090.351371 |
| i (deg) |
38.805628 |
| Ω (om, deg) |
81.411634 |
| ω (w, deg) |
193.265529 |
| M (ma, deg) |
359.999732 |
等級
散乱 + 全体線形
$$
M_a = (13.852 + 2.696\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.852 |
| n |
2.696 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
05:15:19.89 |
+20:58:51.2 |
HIP 24456 |
9.29 |
| 2026-09-20 12:00 |
05:15:19.68 |
+20:58:50.5 |
HIP 24456 |
9.25 |
| 2026-09-21 00:00 |
05:15:19.45 |
+20:58:49.8 |
HIP 24456 |
9.20 |
| 2026-09-21 12:00 |
05:15:19.21 |
+20:58:49.0 |
HIP 24456 |
9.15 |
| 2026-09-22 00:00 |
05:15:18.95 |
+20:58:48.3 |
HIP 24456 |
9.09 |
| 2026-09-22 12:00 |
05:15:18.68 |
+20:58:47.5 |
HIP 24456 |
9.04 |
| 2026-09-23 00:00 |
05:15:18.40 |
+20:58:46.7 |
HIP 24456 |
8.98 |
| 2026-09-23 12:00 |
05:15:18.10 |
+20:58:45.9 |
HIP 24456 |
8.92 |
| 2026-09-24 00:00 |
05:15:17.78 |
+20:58:45.1 |
HIP 24456 |
8.85 |
| 2026-09-24 12:00 |
05:15:17.45 |
+20:58:44.2 |
HIP 24456 |
8.79 |
| 2026-09-25 00:00 |
05:15:17.11 |
+20:58:43.4 |
HIP 24456 |
8.72 |
| 2026-09-25 12:00 |
05:15:16.75 |
+20:58:42.5 |
HIP 24456 |
8.65 |
| 2026-09-26 00:00 |
05:15:16.38 |
+20:58:41.7 |
HIP 24456 |
8.58 |
| 2026-09-26 12:00 |
05:15:16.00 |
+20:58:40.8 |
HIP 24456 |
8.50 |
| 2026-09-27 00:00 |
05:15:15.60 |
+20:58:39.9 |
HIP 24456 |
8.42 |
| 2026-09-27 12:00 |
05:15:15.19 |
+20:58:39.0 |
HIP 24456 |
8.34 |
| 2026-09-28 00:00 |
05:15:14.76 |
+20:58:38.0 |
HIP 24456 |
8.26 |
| 2026-09-28 12:00 |
05:15:14.32 |
+20:58:37.1 |
HIP 24456 |
8.18 |
| 2026-09-29 00:00 |
05:15:13.86 |
+20:58:36.1 |
HIP 24456 |
8.09 |
| 2026-09-29 12:00 |
05:15:13.39 |
+20:58:35.2 |
HIP 24456 |
8.00 |
| 2026-09-30 00:00 |
05:15:12.91 |
+20:58:34.2 |
HIP 24456 |
7.91 |
| 2026-09-30 12:00 |
05:15:12.41 |
+20:58:33.2 |
HIP 24456 |
7.82 |
| 2026-10-01 00:00 |
05:15:11.90 |
+20:58:32.2 |
HIP 24456 |
7.73 |
| 2026-10-01 12:00 |
05:15:11.37 |
+20:58:31.1 |
HIP 24456 |
7.63 |
| 2026-10-02 00:00 |
05:15:10.83 |
+20:58:30.1 |
HIP 24456 |
7.54 |
| 2026-10-02 12:00 |
05:15:10.28 |
+20:58:29.0 |
HIP 24456 |
7.44 |
| 2026-10-03 00:00 |
05:15:09.71 |
+20:58:28.0 |
HIP 24456 |
7.34 |
| 2026-10-03 12:00 |
05:15:09.13 |
+20:58:26.9 |
HIP 24456 |
7.24 |
| 2026-10-04 00:00 |
05:15:08.53 |
+20:58:25.8 |
HIP 24456 |
7.14 |
| 2026-10-04 12:00 |
05:15:07.92 |
+20:58:24.7 |
HIP 24456 |
7.04 |
| 2026-10-05 00:00 |
05:15:07.30 |
+20:58:23.6 |
HIP 24456 |
6.94 |
| 2026-10-05 12:00 |
05:15:06.66 |
+20:58:22.5 |
HIP 24456 |
6.83 |
| 2026-10-06 00:00 |
05:15:06.01 |
+20:58:21.3 |
HIP 24456 |
6.73 |
| 2026-10-06 12:00 |
05:15:05.35 |
+20:58:20.2 |
HIP 24456 |
6.63 |
| 2026-10-07 00:00 |
05:15:04.67 |
+20:58:19.0 |
HIP 24456 |
6.53 |
| 2026-10-07 12:00 |
05:15:03.98 |
+20:58:17.8 |
HIP 24456 |
6.42 |
| 2026-10-08 00:00 |
05:15:03.27 |
+20:58:16.6 |
HIP 24456 |
6.32 |
| 2026-10-08 12:00 |
05:15:02.55 |
+20:58:15.4 |
HIP 24456 |
6.22 |
| 2026-10-09 00:00 |
05:15:01.82 |
+20:58:14.2 |
HIP 24456 |
6.12 |
| 2026-10-09 12:00 |
05:15:01.07 |
+20:58:13.0 |
HIP 24456 |
6.03 |
| 2026-10-10 00:00 |
05:15:00.31 |
+20:58:11.8 |
HIP 24456 |
5.93 |
| 2026-10-10 12:00 |
05:14:59.54 |
+20:58:10.5 |
HIP 24456 |
5.84 |
| 2026-10-11 00:00 |
05:14:58.75 |
+20:58:09.3 |
HIP 24456 |
5.75 |