메타데이터
| 항목 |
값 |
| Designation |
C/2015 V2 (Johnson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-06-12T08:20:20.379840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:16Z |
| Obs used |
5886 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-01-18.0000000 |
| e |
1.00170268 |
| q (au) |
1.636950 |
| a (au) |
-961.396893 |
| i (deg) |
49.874813 |
| Ω (om, deg) |
69.852102 |
| ω (w, deg) |
164.898092 |
| M (ma, deg) |
-0.004806 |
밝기
산란 + 전체 선형
$$
M_a = (12.183 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.183 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.781 |
| k |
0.800 |
| 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 |
| 2015-01-11 |
2017-06-11 |
+1.6631 |
-1.343 |
| 2017-06-12 |
2017-08-29 |
-9.8516 |
+0.988 |
| 2017-08-29 |
2019-10-27 |
+2.9922 |
-2.101 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:59:19.72 |
-16:52:06.7 |
HIP 13952 |
10.11 |
| 2026-05-12 12:00 |
02:59:24.92 |
-16:51:46.9 |
HIP 13952 |
9.21 |
| 2026-05-13 00:00 |
02:59:30.11 |
-16:51:27.4 |
HIP 13952 |
8.42 |
| 2026-05-13 12:00 |
02:59:35.30 |
-16:51:08.3 |
HIP 13952 |
7.77 |
| 2026-05-14 00:00 |
02:59:40.49 |
-16:50:49.6 |
HIP 13952 |
7.29 |
| 2026-05-14 12:00 |
02:59:45.67 |
-16:50:31.2 |
HIP 13952 |
7.03 |
| 2026-05-15 00:00 |
02:59:50.84 |
-16:50:13.1 |
HIP 13952 |
7.00 |
| 2026-05-15 12:00 |
02:59:56.02 |
-16:49:55.5 |
HIP 13952 |
7.20 |
| 2026-05-16 00:00 |
03:00:01.18 |
-16:49:38.2 |
HIP 13952 |
7.62 |
| 2026-05-16 12:00 |
03:00:06.34 |
-16:49:21.2 |
HIP 13972 |
7.72 |
| 2026-05-17 00:00 |
03:00:11.49 |
-16:49:04.7 |
HIP 13972 |
7.89 |
| 2026-05-17 12:00 |
03:00:16.64 |
-16:48:48.5 |
HIP 13972 |
8.26 |
| 2026-05-18 00:00 |
03:00:21.78 |
-16:48:32.6 |
HIP 13972 |
8.80 |
| 2026-05-18 12:00 |
03:00:26.92 |
-16:48:17.2 |
HIP 13972 |
9.48 |
| 2026-05-19 00:00 |
03:00:32.04 |
-16:48:02.1 |
HIP 13972 |
10.27 |
| 2026-05-19 12:00 |
03:00:37.16 |
-16:47:47.3 |
HIP 13972 |
11.14 |
| 2026-05-20 00:00 |
03:00:42.27 |
-16:47:33.0 |
HIP 13972 |
12.09 |
| 2026-05-20 12:00 |
03:00:47.37 |
-16:47:19.0 |
HIP 13972 |
13.08 |
| 2026-05-21 00:00 |
03:00:52.46 |
-16:47:05.3 |
HIP 13972 |
14.12 |
| 2026-05-21 12:00 |
03:00:57.55 |
-16:46:52.1 |
HIP 13972 |
15.18 |
| 2026-05-22 00:00 |
03:01:02.62 |
-16:46:39.2 |
HIP 14101 |
16.15 |
| 2026-05-22 12:00 |
03:01:07.69 |
-16:46:26.7 |
HIP 14101 |
15.14 |
| 2026-05-23 00:00 |
03:01:12.74 |
-16:46:14.5 |
HIP 14101 |
14.17 |
| 2026-05-23 12:00 |
03:01:17.78 |
-16:46:02.7 |
HIP 14101 |
13.25 |
| 2026-05-24 00:00 |
03:01:22.82 |
-16:45:51.3 |
HIP 14101 |
12.39 |
| 2026-05-24 12:00 |
03:01:27.84 |
-16:45:40.3 |
HIP 14101 |
11.61 |
| 2026-05-25 00:00 |
03:01:32.85 |
-16:45:29.6 |
HIP 14101 |
10.90 |
| 2026-05-25 12:00 |
03:01:37.85 |
-16:45:19.4 |
HIP 14101 |
10.31 |
| 2026-05-26 00:00 |
03:01:42.84 |
-16:45:09.4 |
HIP 14101 |
9.83 |
| 2026-05-26 12:00 |
03:01:47.82 |
-16:44:59.9 |
HIP 14101 |
9.48 |
| 2026-05-27 00:00 |
03:01:52.78 |
-16:44:50.7 |
HIP 14101 |
9.29 |
| 2026-05-27 12:00 |
03:01:57.73 |
-16:44:41.9 |
HIP 14101 |
9.26 |
| 2026-05-28 00:00 |
03:02:02.67 |
-16:44:33.4 |
HIP 14101 |
9.38 |
| 2026-05-28 12:00 |
03:02:07.59 |
-16:44:25.4 |
HIP 14101 |
9.66 |
| 2026-05-29 00:00 |
03:02:12.51 |
-16:44:17.7 |
HIP 14101 |
10.07 |
| 2026-05-29 12:00 |
03:02:17.40 |
-16:44:10.4 |
HIP 14101 |
10.60 |
| 2026-05-30 00:00 |
03:02:22.29 |
-16:44:03.4 |
HIP 14101 |
11.24 |
| 2026-05-30 12:00 |
03:02:27.16 |
-16:43:56.8 |
HIP 14101 |
11.95 |
| 2026-05-31 00:00 |
03:02:32.01 |
-16:43:50.6 |
HIP 14101 |
12.74 |
| 2026-05-31 12:00 |
03:02:36.86 |
-16:43:44.8 |
HIP 14101 |
13.58 |
| 2026-06-01 00:00 |
03:02:41.68 |
-16:43:39.3 |
HIP 14101 |
14.47 |
| 2026-06-01 12:00 |
03:02:46.49 |
-16:43:34.2 |
HIP 14101 |
15.39 |
| 2026-06-02 00:00 |
03:02:51.29 |
-16:43:29.5 |
HIP 14101 |
16.35 |