メタデータ
| 項目 |
値 |
| Designation |
110P/Hartley 3 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-10-20T03:50:02.520960Z |
| Orbit solution date (soln_date, UTC) |
2026-09-04T10:19:03Z |
| Obs used |
2428 |
| NEO |
- |
| M1 |
4.900 |
| K1 |
25.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-05-22.0000000 |
| e |
0.31630412 |
| q (au) |
2.464319 |
| a (au) |
3.604408 |
| i (deg) |
11.698674 |
| Ω (om, deg) |
287.529219 |
| ω (w, deg) |
167.393479 |
| M (ma, deg) |
180.371490 |
等級
散乱 + 全体線形
$$
M_a = (8.206 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.206 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.990 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2019-07-25 |
2021-01-23 |
+34.4001 |
-14.061 |
| 2021-01-23 |
2023-05-13 |
-9.1575 |
+6.292 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
20:47:27.10 |
-09:25:45.5 |
HIP 102618 |
5.18 |
| 2026-09-20 12:00 |
20:47:17.30 |
-09:26:34.2 |
HIP 102618 |
6.55 |
| 2026-09-21 00:00 |
20:47:07.73 |
-09:27:22.3 |
HIP 102618 |
8.43 |
| 2026-09-21 12:00 |
20:46:58.40 |
-09:28:09.8 |
HIP 102618 |
10.51 |
| 2026-09-22 00:00 |
20:46:49.32 |
-09:28:56.7 |
HIP 102618 |
12.65 |
| 2026-09-22 12:00 |
20:46:40.47 |
-09:29:43.0 |
HIP 102618 |
14.81 |
| 2026-09-23 00:00 |
20:46:31.87 |
-09:30:28.7 |
HIP 102618 |
16.95 |
| 2026-09-23 12:00 |
20:46:23.51 |
-09:31:13.8 |
HIP 102618 |
19.05 |
| 2026-09-24 00:00 |
20:46:15.40 |
-09:31:58.2 |
HIP 102618 |
21.11 |
| 2026-09-24 12:00 |
20:46:07.53 |
-09:32:42.1 |
HIP 102618 |
23.12 |
| 2026-09-25 00:00 |
20:45:59.90 |
-09:33:25.3 |
HIP 102618 |
25.08 |
| 2026-09-25 12:00 |
20:45:52.53 |
-09:34:07.8 |
HIP 102618 |
26.99 |
| 2026-09-26 00:00 |
20:45:45.40 |
-09:34:49.7 |
HIP 102618 |
28.84 |
| 2026-09-26 12:00 |
20:45:38.51 |
-09:35:30.9 |
HIP 102618 |
30.63 |
| 2026-09-27 00:00 |
20:45:31.88 |
-09:36:11.5 |
HIP 102455 |
31.21 |
| 2026-09-27 12:00 |
20:45:25.49 |
-09:36:51.4 |
HIP 102455 |
30.70 |
| 2026-09-28 00:00 |
20:45:19.36 |
-09:37:30.6 |
HIP 102455 |
30.28 |
| 2026-09-28 12:00 |
20:45:13.47 |
-09:38:09.1 |
HIP 102455 |
29.95 |
| 2026-09-29 00:00 |
20:45:07.84 |
-09:38:47.0 |
HIP 102455 |
29.68 |
| 2026-09-29 12:00 |
20:45:02.45 |
-09:39:24.1 |
HIP 102455 |
29.49 |
| 2026-09-30 00:00 |
20:44:57.32 |
-09:40:00.5 |
HIP 102455 |
29.35 |
| 2026-09-30 12:00 |
20:44:52.44 |
-09:40:36.2 |
HIP 102455 |
29.27 |
| 2026-10-01 00:00 |
20:44:47.81 |
-09:41:11.2 |
HIP 102455 |
29.23 |
| 2026-10-01 12:00 |
20:44:43.43 |
-09:41:45.5 |
HIP 102455 |
29.23 |
| 2026-10-02 00:00 |
20:44:39.31 |
-09:42:19.0 |
HIP 102455 |
29.25 |
| 2026-10-02 12:00 |
20:44:35.44 |
-09:42:51.8 |
HIP 102455 |
29.30 |
| 2026-10-03 00:00 |
20:44:31.82 |
-09:43:23.8 |
HIP 102455 |
29.36 |
| 2026-10-03 12:00 |
20:44:28.46 |
-09:43:55.1 |
HIP 102455 |
29.43 |
| 2026-10-04 00:00 |
20:44:25.35 |
-09:44:25.6 |
HIP 102455 |
29.51 |
| 2026-10-04 12:00 |
20:44:22.50 |
-09:44:55.3 |
HIP 102455 |
29.58 |
| 2026-10-05 00:00 |
20:44:19.90 |
-09:45:24.3 |
HIP 102455 |
29.64 |
| 2026-10-05 12:00 |
20:44:17.56 |
-09:45:52.5 |
HIP 102455 |
29.69 |
| 2026-10-06 00:00 |
20:44:15.47 |
-09:46:19.9 |
HIP 102455 |
29.72 |
| 2026-10-06 12:00 |
20:44:13.64 |
-09:46:46.4 |
HIP 102455 |
29.74 |
| 2026-10-07 00:00 |
20:44:12.07 |
-09:47:12.2 |
HIP 102455 |
29.73 |
| 2026-10-07 12:00 |
20:44:10.75 |
-09:47:37.2 |
HIP 102455 |
29.69 |
| 2026-10-08 00:00 |
20:44:09.69 |
-09:48:01.3 |
HIP 102455 |
29.62 |
| 2026-10-08 12:00 |
20:44:08.88 |
-09:48:24.7 |
HIP 102455 |
29.52 |
| 2026-10-09 00:00 |
20:44:08.33 |
-09:48:47.2 |
HIP 102455 |
29.39 |
| 2026-10-09 12:00 |
20:44:08.04 |
-09:49:08.8 |
HIP 102455 |
29.22 |
| 2026-10-10 00:00 |
20:44:08.00 |
-09:49:29.6 |
HIP 102455 |
29.01 |
| 2026-10-10 12:00 |
20:44:08.22 |
-09:49:49.6 |
HIP 102455 |
28.76 |
| 2026-10-11 00:00 |
20:44:08.69 |
-09:50:08.7 |
HIP 102455 |
28.48 |