메타데이터
| 항목 |
값 |
| Designation |
C/2015 A2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-08-30T11:44:29.256000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
23 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-01-10.0000000 |
| e |
1.01374666 |
| q (au) |
5.266785 |
| a (au) |
-383.131941 |
| i (deg) |
108.899105 |
| Ω (om, deg) |
258.474274 |
| ω (w, deg) |
212.370407 |
| M (ma, deg) |
-0.030555 |
밝기
산란 + 전체 선형
$$
M_a = (5.673 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.673 |
| n |
6.000 |
| gf |
0.982 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.908 |
| 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) |
| 2026-05-12 00:00 |
17:53:01.40 |
-47:48:37.3 |
HIP 87397 |
14.13 |
| 2026-05-12 12:00 |
17:52:54.88 |
-47:48:45.9 |
HIP 87397 |
13.03 |
| 2026-05-13 00:00 |
17:52:48.32 |
-47:48:54.1 |
HIP 87397 |
11.93 |
| 2026-05-13 12:00 |
17:52:41.72 |
-47:49:02.2 |
HIP 87397 |
10.82 |
| 2026-05-14 00:00 |
17:52:35.08 |
-47:49:09.9 |
HIP 87397 |
9.71 |
| 2026-05-14 12:00 |
17:52:28.39 |
-47:49:17.5 |
HIP 87397 |
8.59 |
| 2026-05-15 00:00 |
17:52:21.67 |
-47:49:24.8 |
HIP 87397 |
7.47 |
| 2026-05-15 12:00 |
17:52:14.91 |
-47:49:31.8 |
HIP 87397 |
6.34 |
| 2026-05-16 00:00 |
17:52:08.11 |
-47:49:38.6 |
HIP 87397 |
5.22 |
| 2026-05-16 12:00 |
17:52:01.27 |
-47:49:45.1 |
HIP 87397 |
4.10 |
| 2026-05-17 00:00 |
17:51:54.39 |
-47:49:51.3 |
HIP 87397 |
3.01 |
| 2026-05-17 12:00 |
17:51:47.48 |
-47:49:57.3 |
HIP 87397 |
1.98 |
| 2026-05-18 00:00 |
17:51:40.53 |
-47:50:03.1 |
HIP 87397 |
1.21 |
| 2026-05-18 12:00 |
17:51:33.54 |
-47:50:08.5 |
HIP 87397 |
1.33 |
| 2026-05-19 00:00 |
17:51:26.52 |
-47:50:13.7 |
HIP 87397 |
2.20 |
| 2026-05-19 12:00 |
17:51:19.47 |
-47:50:18.7 |
HIP 87397 |
3.28 |
| 2026-05-20 00:00 |
17:51:12.38 |
-47:50:23.3 |
HIP 87397 |
4.41 |
| 2026-05-20 12:00 |
17:51:05.25 |
-47:50:27.7 |
HIP 87397 |
5.58 |
| 2026-05-21 00:00 |
17:50:58.10 |
-47:50:31.8 |
HIP 87397 |
6.76 |
| 2026-05-21 12:00 |
17:50:50.91 |
-47:50:35.7 |
HIP 87397 |
7.95 |
| 2026-05-22 00:00 |
17:50:43.69 |
-47:50:39.3 |
HIP 87397 |
9.15 |
| 2026-05-22 12:00 |
17:50:36.44 |
-47:50:42.5 |
HIP 87397 |
10.36 |
| 2026-05-23 00:00 |
17:50:29.16 |
-47:50:45.6 |
HIP 87397 |
11.57 |
| 2026-05-23 12:00 |
17:50:21.85 |
-47:50:48.3 |
HIP 87397 |
12.79 |
| 2026-05-24 00:00 |
17:50:14.51 |
-47:50:50.8 |
HIP 87397 |
14.02 |
| 2026-05-24 12:00 |
17:50:07.14 |
-47:50:53.0 |
HIP 87214 |
13.60 |
| 2026-05-25 00:00 |
17:49:59.74 |
-47:50:54.9 |
HIP 87214 |
12.69 |
| 2026-05-25 12:00 |
17:49:52.32 |
-47:50:56.5 |
HIP 87214 |
11.84 |
| 2026-05-26 00:00 |
17:49:44.87 |
-47:50:57.8 |
HIP 87214 |
11.06 |
| 2026-05-26 12:00 |
17:49:37.39 |
-47:50:58.9 |
HIP 87214 |
10.36 |
| 2026-05-27 00:00 |
17:49:29.89 |
-47:50:59.6 |
HIP 87214 |
9.77 |
| 2026-05-27 12:00 |
17:49:22.36 |
-47:51:00.1 |
HIP 87214 |
9.31 |
| 2026-05-28 00:00 |
17:49:14.81 |
-47:51:00.3 |
HIP 87214 |
9.00 |
| 2026-05-28 12:00 |
17:49:07.23 |
-47:51:00.2 |
HIP 87214 |
8.86 |
| 2026-05-29 00:00 |
17:48:59.63 |
-47:50:59.8 |
HIP 87214 |
8.89 |
| 2026-05-29 12:00 |
17:48:52.01 |
-47:50:59.1 |
HIP 87214 |
9.10 |
| 2026-05-30 00:00 |
17:48:44.36 |
-47:50:58.1 |
HIP 87214 |
9.47 |
| 2026-05-30 12:00 |
17:48:36.70 |
-47:50:56.9 |
HIP 87214 |
10.00 |
| 2026-05-31 00:00 |
17:48:29.01 |
-47:50:55.3 |
HIP 87214 |
10.65 |
| 2026-05-31 12:00 |
17:48:21.31 |
-47:50:53.5 |
HIP 87214 |
11.42 |
| 2026-06-01 00:00 |
17:48:13.58 |
-47:50:51.3 |
HIP 87214 |
12.27 |
| 2026-06-01 12:00 |
17:48:05.83 |
-47:50:48.9 |
HIP 87214 |
13.19 |
| 2026-06-02 00:00 |
17:47:58.07 |
-47:50:46.1 |
HIP 87214 |
14.17 |