메타데이터
| 항목 |
값 |
| Designation |
C/2017 D5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-08T20:46:08.676480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:31Z |
| Obs used |
75 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
13.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-03-05.0000000 |
| e |
0.98076543 |
| q (au) |
2.167199 |
| a (au) |
112.672079 |
| i (deg) |
131.038508 |
| Ω (om, deg) |
92.721040 |
| ω (w, deg) |
287.822322 |
| M (ma, deg) |
0.045436 |
밝기
산란 + 전체 선형
$$
M_a = (13.560 + 5.726\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.560 |
| n |
5.726 |
| gf |
1.000 |
| gb |
-0.978 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
00:12:26.56 |
+53:40:17.3 |
HIP 981 |
3.96 |
| 2026-07-29 12:00 |
00:12:21.39 |
+53:40:56.1 |
HIP 981 |
4.02 |
| 2026-07-30 00:00 |
00:12:16.16 |
+53:41:34.5 |
HIP 981 |
4.31 |
| 2026-07-30 12:00 |
00:12:10.87 |
+53:42:12.5 |
HIP 981 |
4.79 |
| 2026-07-31 00:00 |
00:12:05.51 |
+53:42:50.1 |
HIP 981 |
5.41 |
| 2026-07-31 12:00 |
00:12:00.10 |
+53:43:27.2 |
HIP 981 |
6.13 |
| 2026-08-01 00:00 |
00:11:54.63 |
+53:44:03.9 |
HIP 981 |
6.92 |
| 2026-08-01 12:00 |
00:11:49.10 |
+53:44:40.2 |
HIP 981 |
7.76 |
| 2026-08-02 00:00 |
00:11:43.51 |
+53:45:16.1 |
HIP 981 |
8.63 |
| 2026-08-02 12:00 |
00:11:37.86 |
+53:45:51.5 |
HIP 981 |
9.54 |
| 2026-08-03 00:00 |
00:11:32.15 |
+53:46:26.5 |
HIP 981 |
10.46 |
| 2026-08-03 12:00 |
00:11:26.38 |
+53:47:01.0 |
HIP 981 |
11.39 |
| 2026-08-04 00:00 |
00:11:20.56 |
+53:47:35.1 |
HIP 981 |
12.34 |
| 2026-08-04 12:00 |
00:11:14.67 |
+53:48:08.7 |
HIP 981 |
13.31 |
| 2026-08-05 00:00 |
00:11:08.73 |
+53:48:41.9 |
HIP 981 |
14.28 |
| 2026-08-05 12:00 |
00:11:02.74 |
+53:49:14.6 |
HIP 981 |
15.26 |
| 2026-08-06 00:00 |
00:10:56.68 |
+53:49:46.8 |
HIP 981 |
16.24 |
| 2026-08-06 12:00 |
00:10:50.57 |
+53:50:18.6 |
HIP 981 |
17.24 |
| 2026-08-07 00:00 |
00:10:44.40 |
+53:50:49.9 |
HIP 981 |
18.23 |
| 2026-08-07 12:00 |
00:10:38.18 |
+53:51:20.8 |
HIP 981 |
19.24 |
| 2026-08-08 00:00 |
00:10:31.90 |
+53:51:51.2 |
HIP 981 |
20.25 |
| 2026-08-08 12:00 |
00:10:25.57 |
+53:52:21.1 |
HIP 981 |
21.26 |
| 2026-08-09 00:00 |
00:10:19.18 |
+53:52:50.5 |
HIP 656 |
20.48 |
| 2026-08-09 12:00 |
00:10:12.73 |
+53:53:19.4 |
HIP 656 |
19.69 |
| 2026-08-10 00:00 |
00:10:06.24 |
+53:53:47.8 |
HIP 656 |
18.92 |
| 2026-08-10 12:00 |
00:09:59.69 |
+53:54:15.7 |
HIP 656 |
18.16 |
| 2026-08-11 00:00 |
00:09:53.08 |
+53:54:43.2 |
HIP 656 |
17.43 |
| 2026-08-11 12:00 |
00:09:46.42 |
+53:55:10.1 |
HIP 656 |
16.73 |
| 2026-08-12 00:00 |
00:09:39.72 |
+53:55:36.6 |
HIP 656 |
16.06 |
| 2026-08-12 12:00 |
00:09:32.95 |
+53:56:02.5 |
HIP 656 |
15.42 |
| 2026-08-13 00:00 |
00:09:26.14 |
+53:56:27.9 |
HIP 656 |
14.82 |
| 2026-08-13 12:00 |
00:09:19.28 |
+53:56:52.8 |
HIP 656 |
14.28 |
| 2026-08-14 00:00 |
00:09:12.36 |
+53:57:17.2 |
HIP 656 |
13.78 |
| 2026-08-14 12:00 |
00:09:05.40 |
+53:57:41.0 |
HIP 656 |
13.35 |
| 2026-08-15 00:00 |
00:08:58.39 |
+53:58:04.4 |
HIP 656 |
12.99 |
| 2026-08-15 12:00 |
00:08:51.33 |
+53:58:27.2 |
HIP 656 |
12.70 |
| 2026-08-16 00:00 |
00:08:44.22 |
+53:58:49.5 |
HIP 656 |
12.49 |
| 2026-08-16 12:00 |
00:08:37.06 |
+53:59:11.2 |
HIP 656 |
12.36 |
| 2026-08-17 00:00 |
00:08:29.85 |
+53:59:32.5 |
HIP 656 |
12.33 |
| 2026-08-17 12:00 |
00:08:22.60 |
+53:59:53.1 |
HIP 576 |
12.27 |
| 2026-08-18 00:00 |
00:08:15.30 |
+54:00:13.3 |
HIP 576 |
11.25 |
| 2026-08-18 12:00 |
00:08:07.96 |
+54:00:32.9 |
HIP 576 |
10.24 |
| 2026-08-19 00:00 |
00:08:00.57 |
+54:00:52.0 |
HIP 576 |
9.26 |