メタデータ
| 項目 |
値 |
| Designation |
C/2017 T1 (Heinze) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-02-21T16:59:46.164480Z |
| Orbit solution date (soln_date, UTC) |
2019-05-15T15:10:09Z |
| Obs used |
1005 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
14.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-12-14.0000000 |
| e |
1.00034579 |
| q (au) |
0.580655 |
| a (au) |
-1679.227553 |
| i (deg) |
96.833756 |
| Ω (om, deg) |
102.315945 |
| ω (w, deg) |
96.916279 |
| M (ma, deg) |
-0.000998 |
等級
散乱 + 全体線形
$$
M_a = (15.769 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.769 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.678 |
| k |
0.867 |
| 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 |
| 2017-09-28 |
2017-12-30 |
-3.8045 |
+0.570 |
| 2017-12-30 |
2018-01-19 |
+22.8569 |
-1.570 |
| 2018-01-19 |
2018-02-21 |
+13.5047 |
-1.217 |
| 2018-02-23 |
2018-04-23 |
+0.3229 |
-0.952 |
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) |
| 2026-05-12 00:00 |
06:45:18.59 |
-77:11:31.0 |
HIP 32289 |
4.35 |
| 2026-05-12 12:00 |
06:45:34.18 |
-77:10:27.2 |
HIP 32289 |
5.72 |
| 2026-05-13 00:00 |
06:45:49.88 |
-77:09:23.8 |
HIP 32289 |
7.09 |
| 2026-05-13 12:00 |
06:46:05.69 |
-77:08:20.7 |
HIP 32289 |
8.46 |
| 2026-05-14 00:00 |
06:46:21.60 |
-77:07:18.0 |
HIP 32289 |
9.83 |
| 2026-05-14 12:00 |
06:46:37.62 |
-77:06:15.7 |
HIP 32289 |
11.20 |
| 2026-05-15 00:00 |
06:46:53.75 |
-77:05:13.8 |
HIP 32289 |
12.57 |
| 2026-05-15 12:00 |
06:47:09.98 |
-77:04:12.3 |
HIP 32548 |
13.16 |
| 2026-05-16 00:00 |
06:47:26.31 |
-77:03:11.2 |
HIP 32548 |
12.10 |
| 2026-05-16 12:00 |
06:47:42.74 |
-77:02:10.5 |
HIP 32548 |
11.11 |
| 2026-05-17 00:00 |
06:47:59.27 |
-77:01:10.2 |
HIP 32548 |
10.23 |
| 2026-05-17 12:00 |
06:48:15.90 |
-77:00:10.3 |
HIP 32548 |
9.46 |
| 2026-05-18 00:00 |
06:48:32.62 |
-76:59:10.8 |
HIP 32548 |
8.86 |
| 2026-05-18 12:00 |
06:48:49.44 |
-76:58:11.8 |
HIP 32548 |
8.45 |
| 2026-05-19 00:00 |
06:49:06.35 |
-76:57:13.1 |
HIP 32548 |
8.25 |
| 2026-05-19 12:00 |
06:49:23.36 |
-76:56:14.9 |
HIP 32548 |
8.29 |
| 2026-05-20 00:00 |
06:49:40.45 |
-76:55:17.1 |
HIP 32548 |
8.56 |
| 2026-05-20 12:00 |
06:49:57.64 |
-76:54:19.7 |
HIP 32548 |
9.04 |
| 2026-05-21 00:00 |
06:50:14.91 |
-76:53:22.8 |
HIP 32548 |
9.70 |
| 2026-05-21 12:00 |
06:50:32.27 |
-76:52:26.2 |
HIP 32548 |
10.51 |
| 2026-05-22 00:00 |
06:50:49.72 |
-76:51:30.1 |
HIP 32548 |
11.43 |
| 2026-05-22 12:00 |
06:51:07.25 |
-76:50:34.5 |
HIP 32548 |
12.44 |
| 2026-05-23 00:00 |
06:51:24.87 |
-76:49:39.2 |
HIP 32548 |
13.51 |
| 2026-05-23 12:00 |
06:51:42.57 |
-76:48:44.5 |
HIP 32548 |
14.64 |
| 2026-05-24 00:00 |
06:52:00.34 |
-76:47:50.1 |
HIP 32548 |
15.81 |
| 2026-05-24 12:00 |
06:52:18.20 |
-76:46:56.2 |
HIP 32548 |
17.01 |
| 2026-05-25 00:00 |
06:52:36.14 |
-76:46:02.7 |
HIP 33418 |
16.86 |
| 2026-05-25 12:00 |
06:52:54.15 |
-76:45:09.7 |
HIP 33418 |
15.55 |
| 2026-05-26 00:00 |
06:53:12.24 |
-76:44:17.1 |
HIP 33418 |
14.25 |
| 2026-05-26 12:00 |
06:53:30.41 |
-76:43:25.0 |
HIP 33418 |
12.96 |
| 2026-05-27 00:00 |
06:53:48.65 |
-76:42:33.3 |
HIP 33418 |
11.67 |
| 2026-05-27 12:00 |
06:54:06.96 |
-76:41:42.1 |
HIP 33418 |
10.40 |
| 2026-05-28 00:00 |
06:54:25.35 |
-76:40:51.3 |
HIP 33418 |
9.16 |
| 2026-05-28 12:00 |
06:54:43.81 |
-76:40:01.0 |
HIP 33418 |
7.94 |
| 2026-05-29 00:00 |
06:55:02.33 |
-76:39:11.1 |
HIP 33418 |
6.77 |
| 2026-05-29 12:00 |
06:55:20.93 |
-76:38:21.7 |
HIP 33418 |
5.68 |
| 2026-05-30 00:00 |
06:55:39.59 |
-76:37:32.8 |
HIP 33418 |
4.72 |
| 2026-05-30 12:00 |
06:55:58.32 |
-76:36:44.3 |
HIP 33418 |
3.98 |
| 2026-05-31 00:00 |
06:56:17.12 |
-76:35:56.3 |
HIP 33418 |
3.60 |
| 2026-05-31 12:00 |
06:56:35.98 |
-76:35:08.7 |
HIP 33418 |
3.70 |
| 2026-06-01 00:00 |
06:56:54.91 |
-76:34:21.6 |
HIP 33418 |
4.24 |
| 2026-06-01 12:00 |
06:57:13.89 |
-76:33:35.0 |
HIP 33418 |
5.08 |
| 2026-06-02 00:00 |
06:57:32.95 |
-76:32:48.8 |
HIP 33418 |
6.10 |