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
$$
M_a = (5.672 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
5.672 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
17:28:53.22 |
-46:07:05.1 |
HIP 85489 |
18.00 |
| 2026-09-20 12:00 |
17:28:53.64 |
-46:06:27.2 |
HIP 85489 |
17.45 |
| 2026-09-21 00:00 |
17:28:54.13 |
-46:05:49.5 |
HIP 85489 |
16.90 |
| 2026-09-21 12:00 |
17:28:54.67 |
-46:05:11.8 |
HIP 85489 |
16.36 |
| 2026-09-22 00:00 |
17:28:55.27 |
-46:04:34.2 |
HIP 85489 |
15.84 |
| 2026-09-22 12:00 |
17:28:55.93 |
-46:03:56.7 |
HIP 85489 |
15.33 |
| 2026-09-23 00:00 |
17:28:56.66 |
-46:03:19.3 |
HIP 85489 |
14.84 |
| 2026-09-23 12:00 |
17:28:57.44 |
-46:02:42.0 |
HIP 85489 |
14.36 |
| 2026-09-24 00:00 |
17:28:58.27 |
-46:02:04.7 |
HIP 85489 |
13.91 |
| 2026-09-24 12:00 |
17:28:59.17 |
-46:01:27.6 |
HIP 85489 |
13.48 |
| 2026-09-25 00:00 |
17:29:00.13 |
-46:00:50.6 |
HIP 85489 |
13.07 |
| 2026-09-25 12:00 |
17:29:01.14 |
-46:00:13.6 |
HIP 85489 |
12.69 |
| 2026-09-26 00:00 |
17:29:02.21 |
-45:59:36.8 |
HIP 85489 |
12.33 |
| 2026-09-26 12:00 |
17:29:03.34 |
-45:59:00.1 |
HIP 85489 |
12.01 |
| 2026-09-27 00:00 |
17:29:04.53 |
-45:58:23.4 |
HIP 85489 |
11.73 |
| 2026-09-27 12:00 |
17:29:05.77 |
-45:57:46.9 |
HIP 85489 |
11.48 |
| 2026-09-28 00:00 |
17:29:07.08 |
-45:57:10.5 |
HIP 85489 |
11.28 |
| 2026-09-28 12:00 |
17:29:08.44 |
-45:56:34.2 |
HIP 85489 |
11.11 |
| 2026-09-29 00:00 |
17:29:09.85 |
-45:55:58.0 |
HIP 85489 |
10.99 |
| 2026-09-29 12:00 |
17:29:11.33 |
-45:55:21.9 |
HIP 85489 |
10.92 |
| 2026-09-30 00:00 |
17:29:12.86 |
-45:54:45.9 |
HIP 85489 |
10.90 |
| 2026-09-30 12:00 |
17:29:14.44 |
-45:54:10.0 |
HIP 85489 |
10.93 |
| 2026-10-01 00:00 |
17:29:16.09 |
-45:53:34.3 |
HIP 85489 |
11.01 |
| 2026-10-01 12:00 |
17:29:17.78 |
-45:52:58.7 |
HIP 85489 |
11.13 |
| 2026-10-02 00:00 |
17:29:19.54 |
-45:52:23.2 |
HIP 85489 |
11.31 |
| 2026-10-02 12:00 |
17:29:21.35 |
-45:51:47.8 |
HIP 85489 |
11.53 |
| 2026-10-03 00:00 |
17:29:23.22 |
-45:51:12.5 |
HIP 85489 |
11.79 |
| 2026-10-03 12:00 |
17:29:25.14 |
-45:50:37.3 |
HIP 85489 |
12.10 |
| 2026-10-04 00:00 |
17:29:27.12 |
-45:50:02.3 |
HIP 85489 |
12.44 |
| 2026-10-04 12:00 |
17:29:29.15 |
-45:49:27.4 |
HIP 85489 |
12.82 |
| 2026-10-05 00:00 |
17:29:31.24 |
-45:48:52.7 |
HIP 85489 |
13.23 |
| 2026-10-05 12:00 |
17:29:33.38 |
-45:48:18.0 |
HIP 85489 |
13.68 |
| 2026-10-06 00:00 |
17:29:35.58 |
-45:47:43.5 |
HIP 85489 |
14.15 |
| 2026-10-06 12:00 |
17:29:37.83 |
-45:47:09.2 |
HIP 85489 |
14.65 |
| 2026-10-07 00:00 |
17:29:40.13 |
-45:46:34.9 |
HIP 85489 |
15.18 |
| 2026-10-07 12:00 |
17:29:42.49 |
-45:46:00.8 |
HIP 85489 |
15.72 |
| 2026-10-08 00:00 |
17:29:44.91 |
-45:45:26.9 |
HIP 85489 |
16.29 |
| 2026-10-08 12:00 |
17:29:47.37 |
-45:44:53.0 |
HIP 85489 |
16.87 |
| 2026-10-09 00:00 |
17:29:49.89 |
-45:44:19.4 |
HIP 85489 |
17.47 |
| 2026-10-09 12:00 |
17:29:52.47 |
-45:43:45.8 |
HIP 85489 |
18.09 |
| 2026-10-10 00:00 |
17:29:55.09 |
-45:43:12.4 |
HIP 85489 |
18.72 |
| 2026-10-10 12:00 |
17:29:57.77 |
-45:42:39.2 |
HIP 85489 |
19.37 |
| 2026-10-11 00:00 |
17:30:00.50 |
-45:42:06.1 |
HIP 85489 |
20.03 |