메타데이터
| 항목 |
값 |
| Designation |
C/2015 G2 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-05-23T18:53:55.887360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
562 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
6.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-08-16.0000000 |
| e |
1.00039511 |
| q (au) |
0.779858 |
| a (au) |
-1973.798171 |
| i (deg) |
147.562721 |
| Ω (om, deg) |
110.058840 |
| ω (w, deg) |
257.458784 |
| M (ma, deg) |
0.000947 |
밝기
산란 + 전체 선형
$$
M_a = (11.448 + 3.318\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.448 |
| n |
3.318 |
| gf |
1.000 |
| gb |
-0.627 |
| k |
0.956 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2015-03-30 |
2015-04-10 |
-18.6339 |
+0.055 |
| 2015-04-10 |
2015-04-24 |
-23.7310 |
-0.653 |
| 2015-04-24 |
2015-05-23 |
+8.8729 |
-1.009 |
| 2015-05-23 |
2016-02-07 |
+2.0675 |
-1.196 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:11:31.61 |
+46:28:35.7 |
HIP 14892 |
8.74 |
| 2026-09-20 12:00 |
03:11:27.58 |
+46:28:50.9 |
HIP 14892 |
9.44 |
| 2026-09-21 00:00 |
03:11:23.52 |
+46:29:05.9 |
HIP 14892 |
10.16 |
| 2026-09-21 12:00 |
03:11:19.41 |
+46:29:20.6 |
HIP 14892 |
10.87 |
| 2026-09-22 00:00 |
03:11:15.26 |
+46:29:35.0 |
HIP 14892 |
11.60 |
| 2026-09-22 12:00 |
03:11:11.06 |
+46:29:49.1 |
HIP 14892 |
12.34 |
| 2026-09-23 00:00 |
03:11:06.83 |
+46:30:03.0 |
HIP 14892 |
13.08 |
| 2026-09-23 12:00 |
03:11:02.55 |
+46:30:16.6 |
HIP 14892 |
13.82 |
| 2026-09-24 00:00 |
03:10:58.23 |
+46:30:29.9 |
HIP 14892 |
14.58 |
| 2026-09-24 12:00 |
03:10:53.87 |
+46:30:43.0 |
HIP 14892 |
15.34 |
| 2026-09-25 00:00 |
03:10:49.46 |
+46:30:55.7 |
HIP 14892 |
16.10 |
| 2026-09-25 12:00 |
03:10:45.02 |
+46:31:08.2 |
HIP 14892 |
16.87 |
| 2026-09-26 00:00 |
03:10:40.54 |
+46:31:20.4 |
HIP 14892 |
17.65 |
| 2026-09-26 12:00 |
03:10:36.02 |
+46:31:32.3 |
HIP 14892 |
18.43 |
| 2026-09-27 00:00 |
03:10:31.45 |
+46:31:44.0 |
HIP 14892 |
19.22 |
| 2026-09-27 12:00 |
03:10:26.85 |
+46:31:55.3 |
HIP 14892 |
20.02 |
| 2026-09-28 00:00 |
03:10:22.21 |
+46:32:06.4 |
HIP 14892 |
20.82 |
| 2026-09-28 12:00 |
03:10:17.53 |
+46:32:17.1 |
HIP 14892 |
21.62 |
| 2026-09-29 00:00 |
03:10:12.81 |
+46:32:27.6 |
HIP 14892 |
22.43 |
| 2026-09-29 12:00 |
03:10:08.05 |
+46:32:37.8 |
HIP 14892 |
23.25 |
| 2026-09-30 00:00 |
03:10:03.26 |
+46:32:47.7 |
HIP 14892 |
24.07 |
| 2026-09-30 12:00 |
03:09:58.42 |
+46:32:57.3 |
HIP 14892 |
24.90 |
| 2026-10-01 00:00 |
03:09:53.55 |
+46:33:06.6 |
HIP 14892 |
25.73 |
| 2026-10-01 12:00 |
03:09:48.64 |
+46:33:15.6 |
HIP 14892 |
26.57 |
| 2026-10-02 00:00 |
03:09:43.70 |
+46:33:24.2 |
HIP 14892 |
27.41 |
| 2026-10-02 12:00 |
03:09:38.72 |
+46:33:32.6 |
HIP 14892 |
28.26 |
| 2026-10-03 00:00 |
03:09:33.70 |
+46:33:40.7 |
HIP 14892 |
29.11 |
| 2026-10-03 12:00 |
03:09:28.64 |
+46:33:48.5 |
HIP 14892 |
29.97 |
| 2026-10-04 00:00 |
03:09:23.56 |
+46:33:56.0 |
HIP 14892 |
30.83 |
| 2026-10-04 12:00 |
03:09:18.43 |
+46:34:03.2 |
HIP 14892 |
31.70 |
| 2026-10-05 00:00 |
03:09:13.27 |
+46:34:10.1 |
HIP 14892 |
32.57 |
| 2026-10-05 12:00 |
03:09:08.08 |
+46:34:16.6 |
HIP 14892 |
33.45 |
| 2026-10-06 00:00 |
03:09:02.85 |
+46:34:22.9 |
HIP 14448 |
32.94 |
| 2026-10-06 12:00 |
03:08:57.59 |
+46:34:28.8 |
HIP 14448 |
32.16 |
| 2026-10-07 00:00 |
03:08:52.29 |
+46:34:34.4 |
HIP 14448 |
31.38 |
| 2026-10-07 12:00 |
03:08:46.97 |
+46:34:39.7 |
HIP 14448 |
30.61 |
| 2026-10-08 00:00 |
03:08:41.61 |
+46:34:44.7 |
HIP 14448 |
29.85 |
| 2026-10-08 12:00 |
03:08:36.21 |
+46:34:49.4 |
HIP 14448 |
29.10 |
| 2026-10-09 00:00 |
03:08:30.79 |
+46:34:53.8 |
HIP 14448 |
28.35 |
| 2026-10-09 12:00 |
03:08:25.33 |
+46:34:57.8 |
HIP 14448 |
27.62 |
| 2026-10-10 00:00 |
03:08:19.85 |
+46:35:01.5 |
HIP 14448 |
26.90 |
| 2026-10-10 12:00 |
03:08:14.33 |
+46:35:05.0 |
HIP 14448 |
26.19 |
| 2026-10-11 00:00 |
03:08:08.78 |
+46:35:08.0 |
HIP 14448 |
25.50 |