メタデータ
| 項目 |
値 |
| Designation |
C/1984 W2 (Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1985-09-28T09:29:19.821120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
53 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1986-02-18.0000000 |
| e |
0.99947295 |
| q (au) |
4.000285 |
| a (au) |
7589.981412 |
| i (deg) |
89.326939 |
| Ω (om, deg) |
250.204076 |
| ω (w, deg) |
255.271872 |
| M (ma, deg) |
0.000213 |
等級
散乱 + 全体線形
$$
M_a = (4.937 + 4.665\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
4.937 |
| n |
4.665 |
| gf |
0.993 |
| gb |
-0.502 |
| 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 |
17:06:31.47 |
+23:37:36.3 |
HIP 83727 |
4.80 |
| 2026-03-26 12:00 |
17:06:30.89 |
+23:37:58.0 |
HIP 83727 |
5.16 |
| 2026-03-27 00:00 |
17:06:30.29 |
+23:38:19.5 |
HIP 83727 |
5.53 |
| 2026-03-27 12:00 |
17:06:29.68 |
+23:38:41.1 |
HIP 83727 |
5.91 |
| 2026-03-28 00:00 |
17:06:29.04 |
+23:39:02.6 |
HIP 83727 |
6.29 |
| 2026-03-28 12:00 |
17:06:28.39 |
+23:39:24.0 |
HIP 83727 |
6.67 |
| 2026-03-29 00:00 |
17:06:27.73 |
+23:39:45.4 |
HIP 83727 |
7.05 |
| 2026-03-29 12:00 |
17:06:27.04 |
+23:40:06.8 |
HIP 83727 |
7.43 |
| 2026-03-30 00:00 |
17:06:26.34 |
+23:40:28.1 |
HIP 83727 |
7.82 |
| 2026-03-30 12:00 |
17:06:25.63 |
+23:40:49.4 |
HIP 83727 |
8.21 |
| 2026-03-31 00:00 |
17:06:24.89 |
+23:41:10.6 |
HIP 83727 |
8.60 |
| 2026-03-31 12:00 |
17:06:24.14 |
+23:41:31.8 |
HIP 83727 |
8.99 |
| 2026-04-01 00:00 |
17:06:23.38 |
+23:41:52.9 |
HIP 83727 |
9.38 |
| 2026-04-01 12:00 |
17:06:22.59 |
+23:42:13.9 |
HIP 83727 |
9.77 |
| 2026-04-02 00:00 |
17:06:21.79 |
+23:42:35.0 |
HIP 83727 |
10.17 |
| 2026-04-02 12:00 |
17:06:20.98 |
+23:42:55.9 |
HIP 83727 |
10.56 |
| 2026-04-03 00:00 |
17:06:20.15 |
+23:43:16.8 |
HIP 83727 |
10.96 |
| 2026-04-03 12:00 |
17:06:19.30 |
+23:43:37.6 |
HIP 83727 |
11.36 |
| 2026-04-04 00:00 |
17:06:18.43 |
+23:43:58.4 |
HIP 83727 |
11.75 |
| 2026-04-04 12:00 |
17:06:17.55 |
+23:44:19.1 |
HIP 83727 |
12.15 |
| 2026-04-05 00:00 |
17:06:16.66 |
+23:44:39.8 |
HIP 83727 |
12.55 |
| 2026-04-05 12:00 |
17:06:15.75 |
+23:45:00.4 |
HIP 83727 |
12.96 |
| 2026-04-06 00:00 |
17:06:14.82 |
+23:45:20.9 |
HIP 83727 |
13.36 |
| 2026-04-06 12:00 |
17:06:13.87 |
+23:45:41.3 |
HIP 83714 |
13.48 |
| 2026-04-07 00:00 |
17:06:12.91 |
+23:46:01.7 |
HIP 83714 |
13.24 |
| 2026-04-07 12:00 |
17:06:11.94 |
+23:46:22.0 |
HIP 83714 |
13.01 |
| 2026-04-08 00:00 |
17:06:10.95 |
+23:46:42.3 |
HIP 83714 |
12.80 |
| 2026-04-08 12:00 |
17:06:09.94 |
+23:47:02.4 |
HIP 83714 |
12.59 |
| 2026-04-09 00:00 |
17:06:08.92 |
+23:47:22.5 |
HIP 83714 |
12.40 |
| 2026-04-09 12:00 |
17:06:07.88 |
+23:47:42.5 |
HIP 83714 |
12.23 |
| 2026-04-10 00:00 |
17:06:06.83 |
+23:48:02.5 |
HIP 83714 |
12.06 |
| 2026-04-10 12:00 |
17:06:05.76 |
+23:48:22.3 |
HIP 83714 |
11.92 |
| 2026-04-11 00:00 |
17:06:04.68 |
+23:48:42.1 |
HIP 83714 |
11.78 |
| 2026-04-11 12:00 |
17:06:03.58 |
+23:49:01.8 |
HIP 83714 |
11.67 |
| 2026-04-12 00:00 |
17:06:02.47 |
+23:49:21.4 |
HIP 83714 |
11.57 |
| 2026-04-12 12:00 |
17:06:01.34 |
+23:49:40.9 |
HIP 83714 |
11.49 |
| 2026-04-13 00:00 |
17:06:00.20 |
+23:50:00.4 |
HIP 83714 |
11.42 |
| 2026-04-13 12:00 |
17:05:59.04 |
+23:50:19.7 |
HIP 83714 |
11.38 |
| 2026-04-14 00:00 |
17:05:57.87 |
+23:50:39.0 |
HIP 83714 |
11.35 |
| 2026-04-14 12:00 |
17:05:56.68 |
+23:50:58.2 |
HIP 83714 |
11.34 |
| 2026-04-15 00:00 |
17:05:55.48 |
+23:51:17.2 |
HIP 83714 |
11.36 |
| 2026-04-15 12:00 |
17:05:54.26 |
+23:51:36.2 |
HIP 83714 |
11.39 |
| 2026-04-16 00:00 |
17:05:53.03 |
+23:51:55.1 |
HIP 83714 |
11.44 |